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b(in)h(searc)n(h)d(of)i (some)f(go)r(o)r(d)h(for)f(its)1978 1845 y(o)n(wner.)i(Suc)n(h)28 b(an)f(agen)n(t)g(is)g(con\034gured)g(b)n(y)g(its)h(o)n(wner)e(with) 1978 1945 y(all)34 b(the)h(relev)-5 b(an)n(t)35 b(information)f(ab)r (out)g(the)i(desired)e(go)r(o)r(d,)1978 2044 y(the)26 b(constrain)n(ts)f(that)h(de\034ne)h(under)f(whic)n(h)g(conditions)g (an)1978 2144 y(o\033er)g(from)h(a)g(pro)n(vider)f(is)h(acceptable,)f (and)h(a)g(list)h(of)f(some)1978 2244 y(p)r(oten)n(tial)37 b(pro)n(viders)e(of)j(the)g(go)r(o)r(d,)h(to)e(whic)n(h)g(the)h(agen)n (t)1978 2343 y(will)i(migrate)f(in)i(order)d(to)i(query)g(for)f(their)h (o\033er.)74 b(The)1978 2443 y(path)46 b(that)g(de\034nes)g(the)h(agen) n(t's)e(journey)g(b)r(et)n(w)n(een)h(the)1978 2543 y(pro)n(viders)38 b(is)i(called)f(the)i(itinerary)e(of)h(the)g(agen)n(t.)74 b(F)-7 b(ur-)1978 2642 y(thermore,)37 b(the)g(agen)n(t)f(migh)n(t)g (hold)h(information)f(for)g(one)1978 2742 y(or)31 b(sev)n(eral)g(pa)n (ymen)n(t)h(metho)r(ds)h(that)g(it)g(needs)g(to)g(\034nalize)1978 2841 y(a)d(purc)n(hase)f(and)h(whic)n(h)g(should)g(not)h(b)r(e)g(a)n(v) -5 b(ailable)29 b(to)h(an)n(y)1978 2941 y(principal)39 b(other)g(than)h(the)g(one)f(that)h(receiv)n(es)e(the)i(pa)n(y-)1978 3041 y(men)n(t.)62 b(Since)36 b(the)g(agen)n(t)g(is)f(vulnerable)h (when)g(it)g(is)g(exe-)1978 3140 y(cuting)c(at)f(the)i(pro)n(vider,)e (it)h(is)g(necessary)e(that)i(its)h(o)n(wner)1978 3240 y(obtains)e(some)g(guaran)n(tees)e(concerning)i(the)h(execution)f(of) 1978 3340 y(the)f(agen)n(t.)43 b(This)30 b(is,)h(for)f(instance,)g (necessary)e(to)i(prev)n(en)n(t)1978 3439 y(that)42 b(a)g(pro)n(vider)f (remo)n(v)n(es)f(some)i(information)f(ab)r(out)i(a)1978 3539 y(b)r(etter)32 b(o\033er)f(from)h(the)g(memory)f(of)g(the)i(agen)n (t,)f(and)f(th)n(us)1978 3638 y(tric)n(ks)23 b(the)i(agen)n(t)e(in)n (to)h(accepting)g(this)g(pro)n(vider's)f(o\033er.)35 b(A)1978 3738 y(similar)30 b(problem)h(exists)g(for)g(the)h(agen)n(t's) e(itinerary)-7 b(,)32 b(since)1978 3838 y(a)38 b(pro)n(vider)e(can)i (easily)g(forw)n(ard)e(the)j(agen)n(t)e(to)h(an)g(arbi-)1978 3937 y(trary)33 b(pro)n(vider)h(that)h(can)f(or)h(cannot)f(b)r(e)h(on)g (the)g(agen)n(t's)1978 4037 y(itinerary)-7 b(.)61 b(The)36 b(usual)g(approac)n(h)e(that)i(is)g(tak)n(en)f(to)h(pro-)1978 4137 y(vide)25 b(some)g(guaran)n(tees,)f(is)h(to)h(assume)f(that)g(the) h(pro)n(viders)1978 4236 y(are)21 b Fw(truste)l(d)31 b Fy(principals)22 b([12)o(])h(or)e(at)i(least)f(to)h(create)f(a)g(mec) n(h-)1978 4336 y(anism)k(that)h(allo)n(ws)e(to)i(detect)g(whic)n(h)g (of)g(the)g(pro)n(viders)e(on)1978 4435 y(the)j(itinerary)e(misb)r(eha) n(v)n(ed)h([18)o(].)2061 4555 y(The)42 b(notion)g(of)h(trust)f(has)g (long)g(b)r(een)h(recognized)e(as)1978 4654 y(b)r(eing)33 b(of)g(paramoun)n(t)f(imp)r(ortance)g(for)h(the)g(dev)n(elopmen)n(t) 1978 4754 y(of)g(secure)f(systems)g([6,)h(11)o(,)h(23)o(].)53 b(F)-7 b(or)33 b(instance,)h(an)n(y)e(con-)1978 4854 y(ceiv)-5 b(able)23 b(system)g(for)g(authen)n(ticating)g(users)f(needs) h(trusted)1978 4953 y(functionalit)n(y)30 b(that)h(holds)g(the)g (necessary)e(authen)n(tication)1978 5053 y(information)24 b(\(see)g(e.g.,)g([22)o(,)h(16)o(]\).)37 b(Ho)n(w)n(ev)n(er,)23 b(the)i(meaning)1978 5153 y(that)e(is)g(asso)r(ciated)f(with)i(trust)f (or)g(the)g(notion)g(of)g(a)g(trusted)1978 5252 y(principal)38 b(is)h(hardly)f(ev)n(er)g(clearly)g(de\034ned)i(in)f(these)g(ap-)1978 5352 y(proac)n(hes)25 b(and)j(the)g(reader)e(is)h(left)h(with)g(his)g (in)n(tuition.)2061 5471 y(In)19 b(this)g(pap)r(er)g(w)n(e)g(w)n(an)n (t)g(to)g(address)e(the)j(question)f(of)g(ho)n(w)1978 5571 y(trust)38 b(in)g(a)f(certain)h(principal)f(can)h(b)r(e)g(motiv)-5 b(ated)38 b(based)1978 5670 y(on)f(so)r(cial)f(or)h(tec)n(hnical)g (reasoning)f(and)h(w)n(e)g(will)h(discuss)1856 5919 y(1)p eop %%Page: 2 2 2 1 bop -157 36 a Fy(our)27 b(ideas)g(in)h(the)h(con)n(text)e(of)h (protecting)f(the)h(itinerary)f(of)-157 135 y(mobile)h(agen)n(ts.)38 b(W)-7 b(e)29 b(b)r(eliev)n(e)f(that)g(our)g(\034ndings)g(can)g(ha)n(v) n(e)-157 235 y(imp)r(ortan)n(t)33 b(rep)r(ercussions)g(for)g(the)h(arc) n(hitecture)f(of)h(op)r(en)-157 335 y(systems)21 b(for)h(mobile)f(agen) n(ts,)h(where)g(ev)n(eryb)r(o)r(dy)f(should)g(b)r(e)-157 434 y(capable)27 b(to)g(easily)g(b)r(ecome)g(a)g(service)g(pro)n (vider.)-74 535 y(In)40 b(the)g(follo)n(wing)f(Section)h(2,)j(w)n(e)d (will)g(in)n(tro)r(duce)f(our)-157 635 y(mo)r(del)33 b(for)e(mobile)i(agen)n(ts)e(and)h(p)r(oin)n(t)h(out)g(the)f(problems) -157 735 y(related)22 b(to)h(trust)f(within)i(this)f(mo)r(del.)35 b(Then,)24 b(in)f(Section)g(3,)-157 834 y(w)n(e)k(will)h(discuss)f(the) g(notion)g(of)h(trust)f(and)h(de\034ne)f(its)h(rela-)-157 934 y(tion)22 b(to)f(p)r(olicy)-7 b(,)23 b(whic)n(h)e(will)h(enable)f (us)h(to)f(b)r(etter)h(assess)e(the)-157 1034 y(p)r(ossible)34 b(motiv)-5 b(ations)34 b(for)g(trust.)57 b(In)35 b(Section)f(4,)i(w)n (e)e(will)-157 1133 y(in)n(tro)r(duce)c(a)f(piece)h(of)g(trusted)g (hardw)n(are,)f(the)i(TPE,)g(and)-157 1233 y(a)22 b(proto)r(col,)g(the) h(CryPO)f(proto)r(col,)g(whic)n(h)g(will)h(allo)n(w)e(us)h(in)-157 1332 y(Section)e(5)h(to)f(sho)n(w)g(ho)n(w)g(these)h(can)f(b)r(e)h (used)g(to)f(protect)g(the)-157 1432 y(itinerary)32 b(of)i(a)f(mobile)g (agen)n(t)f(relying)h(only)g(on)g(tec)n(hnical)-157 1532 y(means.)38 b(In)28 b(Section)g(6,)g(w)n(e)f(discuss)h(wh)n(y)g(w)n(e)f (consider)g(this)-157 1631 y(to)d(b)r(e)h(a)f(b)r(etter)h(w)n(a)n(y)e (to)h(approac)n(h)f(the)i(problem)e(and)i(what)-157 1731 y(e\033ects)d(this)f(has)g(on)g(the)h(notion)f(of)h(op)r(en)f(systems.) 35 b(Finally)-7 b(,)-157 1831 y(Section)27 b(7)f(concludes)g(the)h(pap) r(er)g(with)g(a)g(summary)e(of)i(the)-157 1930 y(main)g(con)n (tributions.)-157 2212 y Fz(2)131 b(The)44 b(mobile)g(agen)l(t)g (paradigm)-157 2396 y Fy(The)34 b(mobile)h(agen)n(t)e(paradigm)g (\(also)h(referred)f(to)h(as)g(mo-)-157 2496 y(bile)d(co)r(de,)h (mobile)e(computation,)i(or)e(program)e(mobilit)n(y\))-157 2596 y(has)34 b(b)r(een)i(iden)n(ti\034ed)f(b)n(y)g(man)n(y)f(authors)g (as)g(a)h(promising)-157 2695 y(and)j(inno)n(v)-5 b(ativ)n(e)37 b(new)g(approac)n(h)f(to)i(structure)f(problems)-157 2795 y(in)27 b(distributed)h(computing)f([3)o(,)h(4)o(,)f(8,)g(9,)g(19) o(].)37 b(In)27 b([10)o(],)h(Har-)-157 2895 y(rison)i Fw(et.)50 b(al.)f Fy(ha)n(v)n(e)30 b(p)r(oin)n(ted)i(out)g(that)f(the)h (mobile)g(agen)n(t)-157 2994 y(paradigm)25 b(pro)n(vides)f(in)n (teresting)i(solutions)f(to)h(man)n(y)g(real-)-157 3094 y(life)i(problems,)f(for)g(instance)g(in)h(the)g(con)n(text)f(of:)-74 3264 y Fs(\017)41 b Fy(mobile)36 b(users,)j(where)d(agen)n(ts)f(are)h (sen)n(t)g(out)h(from)f(a)9 3364 y(mobile)f(computer)g(in)g(order)f(to) h(accomplish)f(a)h(w)n(ell-)9 3463 y(de\034ned)44 b(task)f(on)g(b)r (ehalf)h(of)f(the)h(user)f(while)g(he)h(is)9 3563 y(disconnected)39 b(from)h(the)g(comm)n(unication)f(net)n(w)n(ork.)9 3663 y(Once)30 b(the)h(user)e(reconnects,)h(the)h(agen)n(t)e(returns)h(and)9 3762 y(rep)r(orts)h(the)h(result)f(of)h(the)g(task)f(or)g(the)h (problems)f(it)9 3862 y(encoun)n(tered.)-74 4033 y Fs(\017)41 b Fy(high-bandwidth)e(in)n(teractions,)h(where)f(an)g(agen)n(t)f(is)9 4133 y(sen)n(t)52 b(to)g(a)f(database)g(serv)n(er)f(that)i(holds)g(a)f (large)9 4233 y(amoun)n(t)31 b(of)g(unstructured)g(data)g(to)h(searc)n (h)d(for)i(some)9 4332 y(sp)r(eci\034c)d(information)e(for)h(the)h (user.)-74 4504 y Fs(\017)41 b Fy(residen)n(t)26 b(agen)n(ts,)g(whic)n (h)h(are)f(stationary)g(agen)n(ts)f(that)9 4604 y(tak)n(e)i(residence)g (at)h(some)f(service)f(pro)n(vider)h(and)g(han-)9 4703 y(dle)36 b(simple)g(routine)g(actions)f(for)h(their)g(o)n(wner)f (\(e.g.,)9 4803 y(comm)n(unication)40 b(managemen)n(t)g(for)h(a)f (mobile)h(user,)9 4902 y(where)24 b(the)g(agen)n(t)f(decides)h(ho)n(w)g (to)g(handle)g(an)g(incom-)9 5002 y(ing)j(comm)n(unication)g (request\).)-74 5172 y(In)38 b(this)h(presen)n(tation,)g(w)n(e)f(are)f (not)h(in)n(terested)g(in)g(the)-157 5272 y(underlying)31 b(tec)n(hnology)f(that)i(is)f(used)h(to)f(implemen)n(t)h(the)-157 5372 y(mobile)e(agen)n(t)g(paradigm,)f(but)i(w)n(e)f(only)g(require)g (a)g(rather)-157 5471 y(simple)h(mo)r(del)g(for)f(our)h(discussion.)46 b(Therefore,)30 b(w)n(e)h(iden-)-157 5571 y(tify)22 b(the)f(follo)n (wing)f(ma)5 b(jor)20 b(abstractions)g(that)h(w)n(e)g(asso)r(ciate)-157 5670 y(with)30 b(mobile)g(agen)n(ts.)41 b(A)30 b(mobile)g(agen)n(t)e (consists)h(of)h(co)r(de,)1978 36 y(data,)35 b(and)f(the)g(curren)n(t)g (execution)f(state,)j(whic)n(h)e(can)g(b)r(e)1978 135 y(marshaled)29 b(b)n(y)i(the)g Fw(agent)h(owner)41 b Fy(in)31 b(a)f(transp)r(ort)g(format)1978 235 y(and)43 b(subsequen)n(tly)f(sen)n(t)h(to)g(the)g Fw(agent)h(exe)l(cutor)p Fy(.)83 b(The)1978 335 y(agen)n(t)37 b(can)h(b)r(e)h(con\034den)n (tialit)n(y)f(and)g(in)n(tegrit)n(y)g(protected)1978 434 y(during)31 b(transit)h(to)h(protect)e(it)i(against)e(outside)h (attac)n(k)n(ers)1978 534 y(through)27 b(the)i(use)f(of)g (cryptographic)e(mec)n(hanisms.)39 b(These)1978 634 y(mec)n(hanisms)31 b(can)h(also)f(pro)n(vide)g(data)g(origin)g(authen)n(tica-)1978 733 y(tion)25 b(for)f(the)i(marshaled)e(agen)n(t.)35 b(The)25 b(agen)n(t)f(executor)g(will)1978 833 y(then)32 b(ev)n(en)n(tually)g(unmarshal)f(the)h(agen)n(t)g(and)g(instan)n(tiate) 1978 933 y(it)i(on)f(a)g(sp)r(ecial)g(en)n(vironmen)n(t)g(lo)r(cated)g (at)g(the)h(agen)n(t)f(ex-)1978 1032 y(ecutor,)23 b(whic)n(h)h(is)g (called)f Fw(agent)j(platform)32 b Fy(\(AP\).)25 b(Here,)f(the)1978 1132 y(mobile)c(agen)n(t)g(can)h(in)n(teract)f(with)h(services)e(of)i (the)g(lo)r(cal)f(AP)1978 1231 y(and)31 b(other)f(agen)n(ts)h(lo)r (cated)g(at)g(this)g(AP)i(and)e(con)n(tin)n(ue)f(to)1978 1331 y(accomplish)d(the)i(task)f(it)h(w)n(as)f(giv)n(en)g(b)n(y)g(the)h (agen)n(t)f(o)n(wner.)1978 1431 y(The)38 b(literature)g(on)g(agen)n(ts) f(\(e.g.,)h([3)o(,)h(12)o(]\))g(distinguishes)1978 1530 y(b)r(et)n(w)n(een)27 b(t)n(w)n(o)g(di\033eren)n(t)h(approac)n(hes)d (to)i(agen)n(t)g(mobilit)n(y:)2061 1679 y Fs(\017)41 b Fy(w)n(eak)26 b(mobilit)n(y)i(and)2061 1836 y Fs(\017)41 b Fy(strong)26 b(mobilit)n(y)-7 b(.)2061 1984 y(The)40 b(former)f(only)h(allo)n(ws)e(a)i(v)n(ery)f(restricted)h(form)f(of)1978 2084 y(mobilit)n(y)-7 b(,)40 b(where)c(the)i(agen)n(t)f(can)g(only)g (migrate)f(once)h(to)1978 2183 y(another)h(AP)-7 b(.)40 b(When)g(it)g(has)f(\034nished,)j(the)e(result)f(of)g(its)1978 2283 y(remote)f(execution)g(will)h(either)f(b)r(e)h(sen)n(t)f(directly) g(to)h(the)1978 2383 y(agen)n(t)21 b(o)n(wner)g(in)i(form)f(of)g(a)g (message,)g(or)f(the)i(agen)n(t)f(itself)g(is)1978 2482 y(returned)h(to)i(the)f(agen)n(t)g(o)n(wner)f(who)h(can)g(then)g (extract)g(the)1978 2582 y(result)31 b(from)g(the)h(agen)n(t.)49 b(Agen)n(ts)31 b(that)h(exhibit)g(this)g(form)1978 2682 y(of)g(mobilit)n(y)h(are)f(usually)g(called)h(one-hop)f(or)g(b)r(o)r (omerang)1978 2781 y(agen)n(ts.)2061 2881 y(The)23 b(latter)g(approac)n (h)f(do)r(es)h(not)g(imp)r(ose)h(suc)n(h)f(a)g(general)1978 2980 y(restriction)c(on)g(agen)n(t)h(mobilit)n(y)-7 b(,)21 b(but)g(allo)n(ws)d(agen)n(ts)h(to)h(visit)1978 3080 y(as)36 b(man)n(y)g(APs)i(as)e(is)h(deemed)g(necessary)e(to)i (accomplish)1978 3180 y(the)d(desired)f(task.)54 b(In)34 b(this)g(approac)n(h,)f(the)h(result)f(of)h(the)1978 3279 y(agen)n(t)25 b(execution)i(can)f(also)f(b)r(e)i(sen)n(t)g (directly)f(to)g(the)h(agen)n(t)1978 3379 y(o)n(wner,)37 b(for)f(instance)h(as)f(an)g(in)n(termediate)g(result)h(b)r(efore)1978 3479 y(eac)n(h)24 b(migration,)g(but)h(usually)f(it)h(is)g(k)n(ept)g (in)g(the)g(execution)1978 3578 y(state)i(of)h(the)g(agen)n(t)f(and)h (transferred)e(to)i(the)g(agen)n(t)f(o)n(wner)1978 3678 y(when)c(the)g(agen)n(t)f(returns.)34 b(Agen)n(ts)22 b(that)h(exhibit)h(this)f(form)1978 3778 y(of)k(mobilit)n(y)h(are)e (usually)h(called)g(m)n(ulti-hop)h(agen)n(ts.)2061 3877 y(The)k(reasons)e(for)h(restricting)g(an)h(agen)n(t's)f(mobilit)n(y)g (are)1978 3977 y(\034rst)36 b(that)h(the)f(execution)g(en)n(vironmen)n (t)g(in)g(the)h(AP)g(and)1978 4076 y(the)25 b(agen)n(t)e(transp)r(ort)h (format)g(can)g(b)r(e)h(m)n(uc)n(h)f(simpler)h(since)1978 4176 y(the)34 b(AP)i(do)r(es)e(not)g(ha)n(v)n(e)f(to)i(pro)n(vide)e (the)h(curren)n(t)g(execu-)1978 4276 y(tion)f(state)h(\(whic)n(h)g(is,) h(for)e(instance,)i(not)f(a)n(v)-5 b(ailable)33 b(from)1978 4375 y(the)j(Ja)n(v)-5 b(a)35 b(virtual)g(mac)n(hine\))h(and)g(the)g (transp)r(ort)f(format)1978 4475 y(do)r(es)25 b(not)h(ha)n(v)n(e)e(to)i (enco)r(de)g(it.)36 b(The)26 b(second)f(reason)f(is)i(that)1978 4575 y(this)40 b(approac)n(h)d(has)i(a)h(simpler)f(trust)h(mo)r(del,)j (since)c(an)n(y)1978 4674 y(damage)24 b(incurred)h(b)n(y)g(the)h(agen)n (t)e(to)h(the)h(AP)g(\(and)g(th)n(us)f(to)1978 4774 y(the)34 b(agen)n(t)e(executor\))h(or)g(b)n(y)g(the)h(AP)g(to)g(the)g(agen)n(t)e (\(and)1978 4873 y(th)n(us)g(to)g(the)h(agen)n(t)f(o)n(wner\))f(can)h (easily)g(b)r(e)h(attributed)f(to)1978 4973 y(the)h(other)f(en)n(tit)n (y)-7 b(.)52 b(If)33 b(more)e(than)i(t)n(w)n(o)f(principals)g(are)f (in-)1978 5073 y(v)n(olv)n(ed,)h(the)h(problem)f(of)g(accoun)n(tabilit) n(y)f(b)r(ecomes)i(m)n(uc)n(h)1978 5172 y(more)22 b(di\036cult)h([12)o (].)36 b(Eac)n(h)22 b(principal)g(can)h(easily)f(defer)g(an)n(y)1978 5272 y(damage)32 b(to)h(actions)g(b)n(y)g(an)n(y)g(of)g(the)h(other)f (principals)g(on)1978 5372 y(the)28 b(agen)n(t's)g(itinerary)-7 b(.)38 b(This)28 b(problem)g(has)g(also)f(b)r(een)i(ad-)1978 5471 y(dressed)c(b)n(y)g(Vigna)g(in)h([18)o(],)h(where)e(he)h(tries)f (to)h(resolv)n(e)e(the)1978 5571 y(problem)h(of)g(ho)n(w)g(to)h (attribute)f(the)h(damage)f(to)g(one)g(of)h(the)1978 5670 y(principals)g(that)i(the)g(agen)n(t)f(visited.)1856 5919 y(2)p eop %%Page: 3 3 3 2 bop -74 36 a Fy(In)22 b(this)g(presen)n(tation,)f(w)n(e)g(are)g(in) n(terested)g(in)h(the)g(protec-)-157 135 y(tion)d(of)h(the)g(agen)n (t's)e(itinerary)-7 b(,)20 b(whic)n(h)f(w)n(e)g(will)h(more)f(clearly) -157 235 y(de\034ne)25 b(in)h(the)f(follo)n(wing)f(section.)36 b(Since)25 b(this)g(implies)g(that)-157 335 y(an)41 b(agen)n(t)f(will)h (generally)f(visit)h(more)f(than)i(t)n(w)n(o)e(princi-)-157 434 y(pals,)23 b(w)n(e)g(will)g(only)f(consider)g(agen)n(t)g(systems)h (that)g(supp)r(ort)-157 534 y(strong)30 b(mobilit)n(y)-7 b(.)46 b(F)-7 b(urthermore,)31 b(w)n(e)f(will)i(mak)n(e)e(the)h(sim-) -157 634 y(plifying)24 b(assumption)f(that)h(the)g(complete)f (itinerary)g(of)g(the)-157 733 y(agen)n(t)g(is)h(pre-de\034ned)f(in)h (adv)-5 b(ance)23 b(and)h(giv)n(en)f(to)g(the)i(agen)n(t)-157 833 y(up)r(on)33 b(startup.)52 b(W)-7 b(e)34 b(will)f(illustrate)f(the) h(problem)g(with)g(a)-157 933 y(small)28 b(example)g(of)h(a)f(shopping) g(agen)n(t,)g(but)h(\034rst)f(w)n(e)g(w)n(an)n(t)-157 1032 y(to)f(discuss)g(the)h(notion)g(of)f(an)g(itinerary)g(in)h(more)e (detail.)-157 1293 y Fr(2.1)112 b(The)38 b(itinerary)-157 1456 y Fy(W)-7 b(e)32 b(assume)e(that)i(the)g(itinerary)e(of)i(an)f (agen)n(t)f(is)i(giv)n(en)e(in)-157 1555 y(the)23 b(form)f(of)h(a)f (list)h(of)g(AP)g(descriptors,)f(whic)n(h)h(iden)n(tify)g(the)-157 1655 y(o)n(wner)31 b(and)h(the)g(net)n(w)n(ork)f(address)g(of)h(the)h (AP)g(as)e(w)n(ell)h(as)-157 1755 y(other)g(relev)-5 b(an)n(t)32 b(information)g(ab)r(out)g(the)h(AP)-7 b(.)34 b(Protecting)-157 1854 y(this)23 b(itinerary)e(is)i(imp)r(ortan)n(t,)g (since)f(w)n(e)h(assume)e(that)i(some)-157 1954 y(agen)n(t)f(executors) f(are)h(more)g(trust)n(w)n(orth)n(y)f(than)i(others)f(and)-157 2053 y(it)33 b(w)n(ould)f(b)r(e)g(go)r(o)r(d)g(if)h(the)f(execution)g (of)h(the)f(agen)n(t)g(could)-157 2153 y(b)r(e)c(limited)g(to)g(the)g (trusted)f(agen)n(t)g(executors.)-74 2258 y(In)k(order)f(to)h(ac)n (hiev)n(e)f(this)h(protection,)g(w)n(e)g(ha)n(v)n(e)f(to)h(en-)-157 2358 y(sure)c(b)r(oth)i(the)f(safet)n(y)g(and)g(the)g(liv)n(eness)f(of) h(the)h(agen)n(t.)37 b(In)-157 2457 y(order)26 b(to)h(ensure)g(the)h (safet)n(y)-7 b(,)27 b(w)n(e)g(ha)n(v)n(e)f(to)i(mak)n(e)e(sure)h(that) -157 2557 y(the)40 b(agen)n(t)f(do)r(es)g(not)g(visit)h(an)n(y)f(AP)h (that)g(is)g(not)f(on)g(its)-157 2657 y(itinerary)-7 b(,)25 b(that)i(it)g(do)r(es)f(visit)g(all)g(the)h(APs)g(that)f(are)f (on)h(its)-157 2756 y(itinerary)-7 b(,)26 b(and)h(that)h(it)f(visits)g (them)h(in)g(the)f(correct)f(order.)-157 2856 y(In)i(an)g(actual)f (implemen)n(tation)i(of)f(this,)g(it)h(is)f(su\036cien)n(t)g(to)-157 2955 y(ensure)39 b(that)g(the)h(agen)n(t)e(starts)h(on)g(the)g(\034rst) g(AP)h(on)f(its)-157 3055 y(itinerary)30 b(and)h(that)g(it)h(tak)n(es)e (eac)n(h)g(step)h(according)e(to)i(its)-157 3155 y(itinerary)-7 b(.)46 b(Ensuring)30 b(the)i(liv)n(eness)d(of)i(an)g(agen)n(t)f(is)h(a) f(task)-157 3254 y(that)37 b(is)g(ev)n(en)f(more)g(di\036cult)h(than)g (ensuring)f(the)h(safet)n(y)-7 b(.)-157 3354 y(It)37 b(consists)e(of)i(mec)n(hanisms)e(with)i(whic)n(h)f(an)g(agen)n(t)g (can,)-157 3454 y(for)29 b(instance,)h(surviv)n(e)f(the)h(crash)f(of)h (the)g(AP)h(on)e(whic)n(h)h(it)-157 3553 y(is)e(executing)f(or)g(cop)r (e)h(with)g(the)h(una)n(v)-5 b(ailabilit)n(y)27 b(of)g(crucial)-157 3653 y(comm)n(unication)34 b(links.)61 b(In)35 b(the)h(follo)n(wing,)g (w)n(e)f(will)h(only)-157 3752 y(giv)n(e)c(some)h(hin)n(ts)g(on)g(ho)n (w)g(this)h(migh)n(t)f(b)r(e)g(accomplished,)-157 3852 y(but)26 b(w)n(e)f(will)g(mainly)g(concen)n(trate)f(on)h(ensuring)g (the)g(safet)n(y)-157 3952 y(of)i(the)h(agen)n(t's)f(itinerary)-7 b(.)-157 4212 y Fr(2.2)112 b(The)38 b(shopping)g(agen)m(t)-157 4375 y Fy(Consider)24 b(the)h(follo)n(wing)f(task:)35 b(a)25 b(user,)g(sa)n(y)f(Alice,)i(tries)f(to)-157 4475 y(\034nd)32 b(the)h(b)r(est)f(o\033er)g(for)f(some)h(item)g(\(e.g.)51 b(a)31 b(CD,)i(an)f(air-)-157 4575 y(line)26 b(tic)n(k)n(et,)f(or)g(a)g (video)g(on)h(demand\))g(from)f(a)g(w)n(ell-de\034ned)-157 4674 y(set)40 b(of)h(pro)n(viders)d(for)i(this)h(item.)77 b(This)40 b(o\033er)g(can)g(b)r(e)h(a)-157 4774 y(quite)f (sophisticated)f(com)n(bination)g(out)h(of)g(sev)n(eral)e(v)-5 b(ari-)-157 4873 y(ables,)33 b(suc)n(h)f(as)f(price,)i(QoS,)f(pa)n (ymen)n(t)g(metho)r(d,)i(deliv)n(ery)-157 4973 y(metho)r(d,)h(etc.)54 b(Alice)34 b(con\034gures)d(her)i(agen)n(t)g(with)g(all)g(the)-157 5073 y(relev)-5 b(an)n(t)31 b(information)h(in)g(order)f(to)h(iden)n (tify)h(the)f(b)r(est)h(of-)-157 5172 y(fer)c(and)f(she)h(also)e(pro)n (vides)h(the)h(itinerary)e(that)i(the)h(agen)n(t)-157 5272 y(is)35 b(supp)r(osed)g(to)g(follo)n(w.)58 b(The)35 b(agen)n(t)g(also)f(con)n(tains)g(pa)n(y-)-157 5372 y(men)n(t)27 b(information)f(that)h(should)f(not)h(b)r(e)g(disclosed)f(to)g(an)n(y) -157 5471 y(principal)39 b(other)g(than)h(the)g(one)f(that)h(receiv)n (es)f(the)h(pa)n(y-)-157 5571 y(men)n(t.)55 b(Alice)33 b(launc)n(hes)g(the)h(agen)n(t)f(b)n(y)g(sending)g(it)h(to)f(the)-157 5670 y(\034rst)28 b(pro)n(vider)f(on)i(the)g(itinerary)-7 b(,)27 b(where)i(it)g(will)f(negotiate)1978 36 y(an)g(o\033er)g(for)g (the)h(item)g(and)g(store)e(this)i(information)f(in)h(its)1978 135 y(curren)n(t)22 b(state.)35 b(Then)23 b(the)g(agen)n(t)f(will)h (migrate)f(to)h(the)g(next)1978 235 y(pro)n(vider)f(on)i(its)g (itinerary)f(and)h(negotiate)g(an)g(o\033er)f(for)h(the)1978 335 y(item)34 b(from)f(this)h(pro)n(vider.)54 b(Once)33 b(the)h(agen)n(t)f(has)g(visited)1978 434 y(all)d(the)h(pro)n(viders)e (on)i(its)f(itinerary)-7 b(,)31 b(it)g(can)g(decide)f(whic)n(h)1978 534 y(of)k(them)i(has)e(pro)n(vided)f(the)i(b)r(est)h(o\033er)e(and)g (it)h(can)g(then)1978 634 y(migrate)c(to)i(this)g(pro)n(vider)e(in)i (order)e(to)h(\034nalize)h(the)g(pur-)1978 733 y(c)n(hase)f (transaction)2611 703 y Fx(2)2646 733 y Fy(.)54 b(This)33 b(b)r(eha)n(viour)f(of)h(the)h(agen)n(t)e(can)1978 833 y(b)r(e)21 b(disturb)r(ed)h(b)n(y)f(the)h(pro)n(viders)d(v)n(ery)i (easily)-7 b(.)34 b(W)-7 b(e)21 b(will)h(no)n(w)1978 933 y(discuss)i(some)f(of)i(the)g(threats)e(that)i(the)g(agen)n(t)e (has)h(to)h(cop)r(e)1978 1032 y(with.)1978 1262 y Fr(2.3)112 b(Threats)38 b(to)e(the)i(shopping)g(agen)m(t)1978 1415 y Fy(There)29 b(are)h(t)n(w)n(o)f(di\033eren)n(t)i(forms)e(of)i (threats)e(to)i(the)f(agen)n(t)1978 1514 y(that)d(w)n(e)h(w)n(an)n(t)f (to)g(consider:)2061 1667 y Fs(\017)41 b Fy(threats)27 b(to)g(the)h(agen)n(t's)e(co)r(de)i(or)f(data)g(and)2061 1826 y Fs(\017)41 b Fy(threats)27 b(to)g(the)h(agen)n(t's)e(itinerary) -7 b(.)2061 1979 y(The)38 b(former)g(are)f(threats)h(to)h(the)g(agen)n (t)e(as)h(an)g(en)n(tit)n(y)1978 2078 y(itself,)21 b(where)d(the)g (agen)n(t)g(executor)g(gains)f(access)h(to)g(in)n(ternal)1978 2178 y(data)29 b(of)h(the)g(agen)n(t)f(or)g(manipulates)h(co)r(de)g(or) f(data)g(of)h(the)1978 2277 y(agen)n(t)f(in)h(order)e(to)i(c)n(hange)f (the)h(b)r(eha)n(viour)f(of)h(the)g(agen)n(t)3875 2247 y Fx(3)1978 2377 y Fy(in)40 b(suc)n(h)h(a)f(w)n(a)n(y)f(that)i(it)g (will)f(not)h(op)r(erate)e(correctly)g(or)1978 2477 y(ev)n(en)f(b)r (eha)n(v)n(e)h(maliciously)f(when)h(executing)g(at)g(another)1978 2576 y(pro)n(vider.)2061 2676 y(The)34 b(latter)g(are)g(threats)f(to)i (the)g(pre-de\034ned)f(itinerary)1978 2776 y(of)26 b(the)h(agen)n(t,)e (where)h(the)h(agen)n(t)f(is)g(forced)g(to)g(skip)g(certain)1978 2875 y(agen)n(t)k(executors)h(on)g(its)h(itinerary)e(or)h(is)g(tric)n (k)n(ed)g(in)n(to)g(ex-)1978 2975 y(ecuting)j(on)g(others)f(that)i(are) e(not)h(on)g(its)h(itinerary)-7 b(.)55 b(The)1978 3074 y(result)26 b(of)g(suc)n(h)g(a)f(manipulation)h(ma)n(y)g(b)r(e)g (similar)g(to)g(those)1978 3174 y(of)h(a)f(direct)h(manipulation)f(of)h (the)h(agen)n(t,)e(but)h(the)h(manip-)1978 3274 y(ulation)22 b(of)h(the)g(agen)n(t's)e(itinerary)h(migh)n(t)h(b)r(e)g(more)f (di\036cult)1978 3373 y(to)g(disco)n(v)n(er.)33 b(As)23 b(an)g(illustration)f(of)g(the)h(problem)f(consider)1978 3473 y(that)i(a)f(pro)n(vider)f(migh)n(t)h(simply)h(not)f(send)h(the)g (agen)n(t)f(to)g(its)1978 3573 y(most)33 b(\034erce)g(comp)r(etitor,)i (so)f(that)g(it)g(can)f(not)h(obtain)g(an)1978 3672 y(o\033er)23 b(from)h(this)g(comp)r(etitor)g(and)g(will)g(th)n(us)g(conclude)g(that) 1978 3772 y(the)31 b(manipulator)e(made)i(the)g(b)r(est)g(o\033er.)45 b(In)31 b(case)f(this)h(ir-)1978 3871 y(regularit)n(y)21 b(is)i(disco)n(v)n(ered,)g(the)h(manipulator)e(could)h(simply)1978 3971 y(pretend)34 b(that)h(the)g(required)e(comm)n(unication)h(link)h (to)f(its)1978 4071 y(comp)r(etitor)d(w)n(as)g(not)g(a)n(v)-5 b(ailable)31 b(and)g(that)h(it)h(did)f(not)g(act)1978 4170 y(maliciously)-7 b(.)2061 4270 y(In)44 b(a)g(con)n(v)n(en)n (tional)e(agen)n(t)h(system,)48 b(when)d(the)f(agen)n(t)1978 4370 y(o)n(wner)33 b(sends)i(a)f(mobile)h(agen)n(t)e(to)i(an)f(agen)n (t)g(executor)g(in)1978 4469 y(order)g(to)i(use)g(some)g(service,)h (the)f(agen)n(t)g(o)n(wner)e(loses)i(all)1978 4569 y(con)n(trol)19 b(o)n(v)n(er)f(the)j(co)r(de)f(and)g(data)g(of)g(the)g(agen)n(t.)34 b(The)20 b(agen)n(t)1978 4668 y(executor)26 b(can:)2061 4821 y Fs(\017)41 b Fy(rev)n(erse)25 b(engineer)i(the)h(agen)n(t's)e (co)r(de,)p 1978 4883 774 4 v 2070 4937 a Ft(2)2105 4960 y Fu(If)c(w)n(e)h(assume)f(that)i(the)g(agen)n(t)g(returns)h(to)f(the)f (c)n(hosen)h(pro)n(vider)1978 5039 y(in)j(order)i(to)f(\034nalize)g (the)h(purc)n(hase)g(transaction,)i(then)d(this)g(consti-)1978 5118 y(tutes)i(a)f(dynamic)f(c)n(hange)i(to)g(the)f(agen)n(t's)h (itinerary)-6 b(,)32 b(whic)n(h)d(w)n(e)g(do)1978 5197 y(not)23 b(allo)n(w)e(in)h(the)h(basic)g(mo)r(del)e(describ)r(ed)j(ab)r (o)n(v)n(e,)f(but)g(only)f(in)g(some)1978 5276 y(relaxations)j (discussed)f(b)r(elo)n(w.)2070 5331 y Ft(3)2105 5355 y Fu(Since)e(it)g(can)g(b)r(e)h(assumed)e(that)i(the)g(co)r(de)f(of)g (an)g(agen)n(t)i(is)d(static,)1978 5434 y(it)f(is)g(p)r(ossible)g(to)h (apply)f(some)g(in)n(tegrit)n(y)i(protection,)h(whic)n(h)d(mak)n(es)g (it)1978 5513 y(m)n(uc)n(h)25 b(more)g(di\036cult)h(for)g(a)g (malicious)e(agen)n(t)j(executor)h(to)e(manipu-)1978 5592 y(late)d(the)h(co)r(de.)32 b(This)22 b(assumption)h(do)r(es,)g(ho) n(w)n(ev)n(er,)h(not)g(hold)f(for)g(the)1978 5670 y(agen)n(t's)h(data.) 1856 5919 y Fy(3)p eop %%Page: 4 4 4 3 bop -74 36 a Fs(\017)41 b Fy(analyze)26 b(the)i(agen)n(t's)f(data,) -74 201 y Fs(\017)41 b Fy(arbitrarily)26 b(c)n(hange)g(the)i(agen)n (t's)e(co)r(de)i(or)e(data,)h(or)-74 367 y Fs(\017)41 b Fy(send)27 b(the)h(agen)n(t)f(to)h(an)n(y)e(arbitrary)g(agen)n(t)g (executor.)-74 532 y(This)19 b(constellation)f(puts)h(the)g(agen)n(t)f (executor)g(in)h(a)g(m)n(uc)n(h)-157 631 y(stronger)36 b(p)r(osition)h(than)h(the)h(agen)n(t)d(o)n(wner.)67 b(The)38 b(agen)n(t)-157 731 y(o)n(wner)32 b(simply)h(has)g(to)g(trust) g(the)g(agen)n(t)f(executor)h(not)g(to)-157 831 y(use)41 b(the)i(metho)r(ds)e(describ)r(ed)h(ab)r(o)n(v)n(e)e(to)i(illicitly)g (obtain)-157 930 y(con\034den)n(tial)e(information)g(from)h(the)g(agen) n(t)f(that)h(it)g(has)-157 1030 y(to)36 b(carry)f(in)i(order)f(to)g (use)h(the)g(service)f(or)f(to)i(protect)f(it)-157 1130 y(against)30 b(c)n(hanges)g(to)i(the)g(agen)n(t's)e(itinerary)-7 b(.)48 b(There)31 b(is)h(no)-157 1229 y(w)n(a)n(y)19 b(for)i(the)g(agen)n(t)e(o)n(wner)h(to)g(con)n(trol)g(or)g(ev)n(en)g (kno)n(w)g(ab)r(out)-157 1329 y(the)28 b(b)r(eha)n(viour)e(of)i(the)g (agen)n(t)e(executor.)-74 1428 y(The)g(reason)e(for)i(the)g(im)n (balance)f(b)r(et)n(w)n(een)h(agen)n(t)f(execu-)-157 1528 y(tor)40 b(and)h(agen)n(t)f(o)n(wner)g(in)h(the)g(mobile)g(agen)n (t)f(mo)r(del)h(as)-157 1628 y(compared)31 b(to)h(service)f(pro)n (vider)f(and)i(service)f(user)g(in)h(the)-157 1727 y(clien)n(t/serv)n (er)18 b(mo)r(del)i(is)h(that)f(in)h(the)g(former)e(approac)n(h,)h(the) -157 1827 y(agen)n(t)i(o)n(wner)f(has)i(no)f(guaran)n(tees)f(whatso)r (ev)n(er)g(concerning)-157 1927 y(the)39 b(execution)g(of)g(its)g(agen) n(t.)69 b(In)39 b(the)h(clien)n(t/serv)n(er)c(ap-)-157 2026 y(proac)n(h,)f(the)g(service)f(user)g(relies)h(on)f(man)n(y)g (assumptions)-157 2126 y(that)26 b(are)f(so)g(basic)h(that)g(one)f (hardly)g(ev)n(er)g(thinks)h(of)g(them.)-157 2226 y(Nev)n(ertheless,)19 b(these)g(guaran)n(tees)d(allo)n(w)i(to)g(implemen)n(t)i(cer-)-157 2325 y(tain)33 b(t)n(yp)r(es)g(of)f(b)r(eha)n(viour)g(in)h(the)g(clien) n(t)g(part)g(of)g(the)g(dis-)-157 2425 y(tributed)f(application)f(that) h(can)f(not)h(b)r(e)g(implemen)n(ted)g(in)-157 2524 y(con)n(v)n(en)n (tional)16 b(agen)n(t)i(systems)g(\(e.g.,)i(co)r(de)e(will)h(b)r(e)g (executed)-157 2624 y(at)j(most)g(once,)g(co)r(de)g(will)g(b)r(e)h (executed)f(correctly)-7 b(,)22 b(requests)-157 2724 y(will)j(b)r(e)h(sen)n(t)f(to)g(serv)n(ers)e(in)i(a)g(particular)f(and) h(w)n(ell-de\034ned)-157 2823 y(order,)40 b(a)n(v)-5 b(ailabilit)n(y)38 b(of)h(a)f(reasonably)f(reliable)h(time)i(ser-)-157 2923 y(vice,)28 b(etc.\).)40 b(This)29 b(adv)-5 b(an)n(tage)26 b(relies)i(on)g(the)h(fact)g(that)f(the)-157 3023 y(clien)n(t)e (implemen)n(tation)g(is)h(under)f(the)g(ph)n(ysical)g(con)n(trol)f(of) -157 3122 y(the)32 b(service)f(user.)50 b(Based)32 b(on)f(these)h (assumptions,)h(a)f(ser-)-157 3222 y(vice)23 b(user)f(can)h(observ)n(e) e(what)i(is)g(happ)r(ening)g(in)g(the)h(system)-157 3321 y(and)i(notice)h(irregularities.)34 b(Th)n(us,)27 b(he)f(is)h(able)f (to)h(react)e(ac-)-157 3421 y(cordingly)-7 b(,)25 b(for)h(instance,)g (to)g(in)n(terrupt)f(an)h(ongoing)f(trans-)-157 3521 y(action.)35 b(Another)24 b(p)r(ossibilit)n(y)g(to)g(tak)n(e)g(adv)-5 b(an)n(tage)22 b(of)j(these)-157 3620 y(assumptions)j(w)n(ould)h(b)r(e) g(to)h(log)e(an)n(y)g(irregularities)f(at)i(the)-157 3720 y(clien)n(t)24 b(side)g(so)f(that)h(they)g(can)f(b)r(e)i(pro)n (vided)e(as)g(evidence)g(in)-157 3820 y(the)28 b(case)f(of)g(a)g (dispute)h(with)g(some)f(service)g(pro)n(vider.)-74 3919 y(W)-7 b(e)49 b(in)n(tend)g(to)f(create)f(an)h(en)n(vironmen)n(t)g(for) g(mobile)-157 4019 y(agen)n(ts)38 b(that)i(allo)n(ws)e(them)i(to)f (base)g(their)g(execution)g(on)-157 4118 y(similar)25 b(assumptions,)h(so)g(that)h(it)f(b)r(ecomes)g(p)r(ossible)g(for)g(a) -157 4218 y(mobile)f(agen)n(t)f(to)h(protect)g(itself)h(from)f(a)f (malicious)h(service)-157 4318 y(pro)n(vider.)-157 4592 y Fz(3)131 b(The)44 b(notion)g(of)g(trust)-157 4774 y Fy(W)-7 b(e)27 b(already)e(men)n(tioned)i(the)g(imp)r(ortance)f(of)g (trust)h(for)f(se-)-157 4873 y(curit)n(y)d(in)h(distributed)g(systems)f (and)h(p)r(oin)n(ted)g(out)f(the)i(lac)n(k)-157 4973 y(of)38 b(a)f(clear)g(de\034nition)i(of)e(what)h(is)g(mean)n(t)g(b)n(y) g(the)g(terms)-157 5073 y(trusted)29 b(principal)f(or)g(trusted)h (system.)41 b(In)29 b(the)h(follo)n(wing,)-157 5172 y(w)n(e)d(presen)n (t)g(our)h(analysis)e(of)i(p)r(ossible)f(trust)h(relations)f(b)r(e-) -157 5272 y(t)n(w)n(een)g(di\033eren)n(t)h(principals.)-74 5372 y(A)34 b(reason)e(for)h(the)h(lac)n(k)e(of)i(a)f(clear)f (de\034nition)i(of)g(trust)-157 5471 y(could)21 b(b)r(e)h(that)g(trust) f(is)g(more)g(a)g(so)r(cial)g(than)g(a)g(tec)n(hnical)g(is-)-157 5571 y(sue)29 b(and)f(consequen)n(tly)g(quite)i(di\036cult)f(to)g(tac)n (kle)f(en)n(tirely)-157 5670 y(in)38 b(a)f(tec)n(hnical)g(approac)n(h.) 65 b(The)37 b(ma)5 b(jor)37 b(problem)g(stems)1978 36 y(from)26 b(the)i(fact)f(that)g(the)h(notion)f(of)g(trust)g(mixes)f (the)i(goals)1978 135 y(of)19 b(a)g(principal)g(with)i(its)e(b)r(eha)n (viour)g(to)g(ac)n(hiev)n(e)f(these)i(goals.)1978 235 y(In)h(order)e(to)i(trust)f(some)g(principal,)i(it)f(is)g(usually)f (necessary)1978 335 y(to)28 b(concur)f(with)i(or)e(at)h(least)g(appro)n (v)n(e)e(of)i(its)h(goals)d(\(whic)n(h)1978 434 y(are)33 b(not)i(alw)n(a)n(ys)d(clearly)h(stated\))i(and)f(to)h(b)r(eliev)n(e)f (that)h(it)1978 534 y(will)27 b(b)r(eha)n(v)n(e)g(accordingly)-7 b(.)34 b(In)28 b(our)e(de\034nition)i(of)f(trust,)h(w)n(e)1978 634 y(will)c(try)g(to)g(clearly)f(separate)g(these)i(t)n(w)n(o)e (issues)h(b)n(y)g(gather-)1978 733 y(ing)k(the)i(goals)d(of)i(a)f (principal)g(in)i(a)e(p)r(olicy)-7 b(,)29 b(whic)n(h)g(is)g(a)f(set) 1978 833 y(of)23 b(rules)f(that)i(constrains)d(the)j(b)r(eha)n(viour)d (of)i(this)h(principal)1978 933 y(for)34 b(all)h(conceiv)-5 b(able)34 b(situations.)59 b(This)35 b(p)r(olicy)g(has)g(to)g(b)r(e) 1978 1032 y(written)c(do)n(wn)g(and)g(made)h(a)n(v)-5 b(ailable)30 b(to)h(all)g(other)g(princi-)1978 1132 y(pals)26 b(that)h(in)n(teract)f(with)h(the)g(issuer)f(of)h(the)g(p)r(olicy)-7 b(.)36 b(Then,)1978 1231 y(w)n(e)27 b(de\034ne)g Fw(trust)h(in)i (another)g(princip)l(al)38 b Fy(as)26 b(the)i(b)r(elief)g(that)1978 1331 y(it)g(will)f(adhere)g(to)h(its)f(published)h(p)r(olicy)-7 b(.)2061 1445 y(The)28 b(question)g(of)h(whether)f(a)g(certain)g (principal)g(can)g(b)r(e)1978 1544 y(trusted)c(no)n(w)g(consists)g(of)g (\(a\))h(c)n(hec)n(king)e(its)i(published)g(p)r(ol-)1978 1644 y(icy)h(in)h(order)e(to)h(decide)g(if)h(it)g(is)g(acceptable)e (and)h(\(b\))i(to)e(es-)1978 1743 y(tablish)k(a)g(motiv)-5 b(ation)30 b(for)f(the)i(b)r(elief)g(that)f(it)h(will)f(adhere)1978 1843 y(to)k(its)g(published)h(p)r(olicy)-7 b(.)56 b(The)35 b(former)e(is)h(quite)h(di\036cult)1978 1943 y(but)28 b(can)e(b)r(e)i(supp)r(orted)f(b)n(y)g(a)g(formal)g(sp)r(eci\034cation) g(of)g(the)1978 2042 y(securit)n(y)g(p)r(olicy)i(\(similar)f(to)h(the)g (approac)n(h)e(in)i([14)o(]\).)40 b(The)1978 2142 y(latter,)29 b(ho)n(w)n(ev)n(er,)f(is)h(a)g(problem)f(that)i(is)f(quite)g (di\036cult)h(to)1978 2242 y(formalize.)2061 2355 y(W)-7 b(e)29 b(ha)n(v)n(e)f(iden)n(ti\034ed)h(t)n(w)n(o)f(fundamen)n(tally)h (di\033eren)n(t)g(ap-)1978 2455 y(proac)n(hes)i(to)i(the)h(problem)f (of)h(trust:)48 b(the)34 b Fw(optimistic)j(ap-)1978 2554 y(pr)l(o)l(ach)p Fy(,)47 b(where)42 b(w)n(e)g(giv)n(e)f(an)h(en)n(tit)n (y)g(the)h(b)r(ene\034t)g(of)f(the)1978 2654 y(doubt)c(and)g(assume)f (that)h(it)g(will)h(b)r(eha)n(v)n(e)e(prop)r(erly)f(and)1978 2754 y(try)j(to)h(punish)h(an)n(y)e(violation)g(of)h(the)g(published)g (p)r(olicy)1978 2853 y(afterw)n(ards;)c(and)f(a)g Fw(p)l(essimistic)i (appr)l(o)l(ach)p Fy(,)j(in)35 b(whic)n(h)g(w)n(e)1978 2953 y(try)24 b(to)g(prev)n(en)n(t)g(an)n(y)g(violation)f(of)i(the)g (published)g(p)r(olicy)f(in)1978 3052 y(adv)-5 b(ance,)39 b(b)n(y)d(e\033ectiv)n(ely)h(constraining)f(the)h(p)r(ossible)g(ac-) 1978 3152 y(tions)26 b(of)h(a)f(principal)h(to)f(those)h(conforming)e (to)i(the)g(p)r(olicy)-7 b(.)1978 3252 y(Both)33 b(of)h(these)g (approac)n(hes)e(ha)n(v)n(e)h(their)g(adv)-5 b(an)n(tages)32 b(and)1978 3351 y(disadv)-5 b(an)n(tages.)2061 3465 y(The)21 b(optimistic)h(approac)n(h)e(is)i(easy)e(to)i(implemen)n(t,)i(since) 1978 3564 y(it)f(do)r(es)f(not)g(require)g(an)n(y)f(sp)r(ecial)i (measures)e(to)h(mak)n(e)g(some)1978 3664 y(in)n(teraction)36 b(p)r(ossible.)64 b(This)37 b(is)g(probably)e(wh)n(y)i(it)g(is)g(the) 1978 3764 y(basis)d(for)h(most)h(business)f(done)g(to)r(da)n(y)-7 b(.)60 b(Ho)n(w)n(ev)n(er,)35 b(it)h(re-)1978 3863 y(quires)c(some)h(p) r(ossibilit)n(y)g(to)g(disco)n(v)n(er)e(a)i(p)r(olicy)g(violation)1978 3963 y(after)i(it)i(has)e(o)r(ccurred.)61 b(If)37 b(suc)n(h)e(a)h(p)r (ossibilit)n(y)g(do)r(es)f(not)1978 4063 y(exist,)41 b(then)e(the)g(approac)n(h)e(degenerates)g(to)i Fw(blind)i(trust)p Fy(,)1978 4162 y(whic)n(h)25 b(indicates)g(that)h(there)g(is)f(no)g (particular)g(motiv)-5 b(ation)1978 4262 y(to)24 b(b)r(eliev)n(e)h (that)g(a)f(principal)g(will)h(adhere)f(to)h(its)g(published)1978 4361 y(p)r(olicy)g(other)g(than)h(its)f(o)n(wn)g(assertion.)35 b(Blind)26 b(trust)f(is)h(ob-)1978 4461 y(viously)h(a)g(v)n(ery)g(w)n (eak)f(foundation)i(for)f(trust)h(and)f(not)h(rec-)1978 4561 y(ommended)34 b(for)g(an)n(y)f(imp)r(ortan)n(t)h(or)f (\034nancially)h(v)-5 b(aluable)1978 4660 y(transaction.)33 b(It)23 b(is)f(therefore)f(imp)r(ortan)n(t)g(to)h(mak)n(e)g(the)g(risk) 1978 4760 y(that)f(a)f(p)r(olicy)h(violation)f(is)h(disco)n(v)n(ered)e (as)h(high)h(as)g(p)r(ossible)1978 4860 y(b)n(y)27 b(impro)n(ving)f (con)n(trols)g(and)h(establishing)g(c)n(hec)n(kp)r(oin)n(ts.)2061 4973 y(Once)33 b(a)g(p)r(olicy)g(violation)g(is)g(disco)n(v)n(ered)e (and)j(if)g(it)g(can)1978 5073 y(further)24 b(irrefutably)h(b)r(e)g (attributed)g(to)g(one)g(of)g(the)g(partici-)1978 5172 y(pan)n(ts)i(in)g(the)h(corresp)r(onding)d(transaction,)h(this)i (principal)1978 5272 y(should)d(b)r(e)h(punished)g(according)d(to)j (the)g(appropriate)d(la)n(ws)1978 5372 y(and)31 b(the)g(damage)f (caused)g(b)n(y)h(the)h(p)r(olicy)f(violation.)46 b(The)1978 5471 y(goal)22 b(of)i(this)g(punishmen)n(t)g(is)g(primarily)e(to)i (deter)f(p)r(oten)n(tial)1978 5571 y(violators)31 b(from)i(committing)h (suc)n(h)f(a)g(p)r(olicy)h(violation)e(in)1978 5670 y(the)c(\034rst)f (place.)38 b(Dep)r(ending)28 b(on)g(ho)n(w)f(this)h(punishmen)n(t)g(is) 1856 5919 y(4)p eop %%Page: 5 5 5 4 bop -157 36 a Fy(enacted,)25 b(w)n(e)g(iden)n(tify)g(the)h(follo)n (wing)d(t)n(w)n(o)i(motiv)-5 b(ations)24 b(for)-157 135 y(the)33 b(b)r(elief)h(that)f(an)g(en)n(tit)n(y)g(will)g(adhere)f(to)h (its)g(published)-157 235 y(p)r(olicy:)-74 412 y Fs(\017)41 b Fy(trust)28 b(based)f(on)g(\(a)g(go)r(o)r(d\))g(reputation)-74 593 y Fs(\017)41 b Fy(trust)28 b(based)f(on)g(con)n(trol)f(and)h (punishmen)n(t)-74 770 y(T)-7 b(rust)26 b(based)f(on)h(reputation)f (stems)h(from)g(the)g(fact)g(that)-157 870 y(the)32 b(principal)g(in)g (question)f(is)h(w)n(ell)g(kno)n(wn)f(and)g(has)h(v)n(ery)-157 969 y(little)26 b(to)f(gain)f(through)g(a)h(violation)f(of)h(its)h(o)n (wn)e(p)r(olicy)h(but)-157 1069 y(a)34 b(lot)g(to)h(lose)e(in)i(case)f (a)g(p)r(olicy)g(violation)f(is)i(disco)n(v)n(ered.)-157 1169 y(This)e(loss)g(is)h(supp)r(osed)f(to)h(transpire)e(from)h(the)h (lost)g(rev-)-157 1268 y(en)n(ue)40 b(due)g(to)g(customers)f(taking)h (their)g(business)f(to)h(an-)-157 1368 y(other)35 b(principal.)61 b(Reputation)36 b(is)g(an)g(asset)f(that)h(is)g(v)n(ery)-157 1468 y(exp)r(ensiv)n(e)d(to)g(build)h(up)g(and)f(that)h(is)g(in)n(v)-5 b(aluable)32 b(for)h(an)n(y)-157 1567 y(compan)n(y)-7 b(.)38 b(Th)n(us,)28 b(a)g(principal)g(w)n(ould)g(not)g(risk)g(to)g (lose)f(its)-157 1667 y(go)r(o)r(d)20 b(reputation)h(for)g(a)g(small)g (gain)f(and)h(will)h(consequen)n(tly)-157 1766 y(rather)k(adhere)h(to)h (its)f(p)r(olicy)-7 b(.)-74 1870 y(T)g(rust)25 b(based)f(on)h(con)n (trol)f(and)h(punishmen)n(t)h(means)e(that)-157 1969 y(w)n(e)37 b(do)g(not)g(trust)g(the)h(principal)f(at)g(all,)i(but)f (rather)e(the)-157 2069 y(underlying)k(tec)n(hnical)f(and)h(legal)g (framew)n(ork)e(to)i(ensure)-157 2169 y(the)32 b(principal's)f(prop)r (er)f(b)r(eha)n(viour.)47 b(Here,)32 b(w)n(e)f(explicitly)-157 2268 y(in)n(tro)r(duce)21 b(the)h(same)f(tradeo\033)g(b)n(y)g(normal)g (disciplinary)f(ac-)-157 2368 y(tions)k(suc)n(h)g(as)f(\034nes)h(or)g (imprisonmen)n(t,)g(dep)r(ending)g(on)g(the)-157 2468 y(sev)n(erit)n(y)18 b(of)h(the)h(o\033ence.)34 b(The)20 b(short)f(term)g(gain)g(that)h(migh)n(t)-157 2567 y(b)r(e)28 b(ac)n(hiev)n(ed)e(through)h(a)g(p)r(olicy)g(violation)g(is)g(supp)r (osed)h(to)-157 2667 y(b)r(e)g(negated)f(b)n(y)g(appropriate)f (punishmen)n(t.)-74 2770 y(Ob)n(viously)-7 b(,)23 b(there)g(are)f(man)n (y)h(other)g(problems)f(with)i(this)-157 2870 y(approac)n(h,)h(suc)n(h) h(as)g(the)h(enforcemen)n(t)f(of)h(la)n(ws,)e(whic)n(h)i(can)-157 2969 y(b)r(e)h(v)n(ery)f(exp)r(ensiv)n(e,)h(is)g(usually)g(quite)g(slo) n(w,)g(and)g(is)g(some-)-157 3069 y(times)e(v)n(ery)e(complex)h(\(in)h (particular)e(if)i(the)g(la)n(ws)e(of)i(di\033er-)-157 3169 y(en)n(t)33 b(coun)n(tries)f(are)g(applicable\))h(or)f(the)i (di\033eren)n(t)f(p)r(ercep-)-157 3268 y(tions)d(of)h(punishmen)n(t.)46 b(A)30 b(p)r(erson)g(who)g(has)g(not)h(m)n(uc)n(h)f(to)-157 3368 y(lose)22 b(migh)n(t)h(readily)e(risk)h(some)g(y)n(ears)f(of)i (imprisonmen)n(t)f(for)-157 3468 y(the)28 b(p)r(ossibilit)n(y)f(of)h(a) f(relativ)n(ely)f(large)g(gain.)-74 3571 y(Another)36 b(problem)g(in)h(the)f(approac)n(h)f(stems)h(from)g(the)-157 3670 y(fact)28 b(that)f(man)n(y)g(abuses)g(of)h(con\034den)n(tial)f (information)g(are)-157 3770 y(not)21 b(necessarily)e(conducted)i(for)g (the)h(purp)r(oses)e(of)h(the)g(com-)-157 3870 y(pan)n(y)26 b(that)i(holds)f(this)g(information,)g(but)h(rather)e(b)n(y)h(mali-) -157 3969 y(cious)22 b(insiders)g(of)g(suc)n(h)g(a)g(compan)n(y)-7 b(,)23 b(who)f(do)g(it)h(for)f(strictly)-157 4069 y(p)r(ersonal)35 b(reasons)f(or)h(\034nancial)g(b)r(ene\034ts)h([17,)g(21)o(].)62 b(Suc)n(h)-157 4169 y(abuses)34 b(are)f(ev)n(en)i(more)e(di\036cult)j (to)e(disco)n(v)n(er)f(\(there)i(are)-157 4268 y(less)c(p)r(eople)h(in) n(v)n(olv)n(ed\))f(and)h(to)f(punish)i(\(it)f(has)g(to)g(b)r(e)g(de-) -157 4368 y(cided)40 b(if)g(only)g(the)g(emplo)n(y)n(ee)f(for)g (malicious)g(b)r(eha)n(viour,)-157 4467 y(only)31 b(the)h(compan)n(y)e (for)h(negligence,)g(or)g(b)r(oth)h(ha)n(v)n(e)e(to)h(b)r(e)-157 4567 y(pursued\).)-74 4670 y(The)e(problem)g(to)g(reliably)f(disco)n(v) n(er)g(a)h(p)r(olicy)g(violation)-157 4770 y(could)k(b)r(e)g(resolv)n (ed)f(b)n(y)h(requiring)f(a)g(v)n(ery)g(high)i(degree)e(of)-157 4870 y(transparency)-7 b(.)34 b(Ho)n(w)n(ev)n(er,)23 b(this)i(is)f(di\036cult)h(to)g(ac)n(hiev)n(e)e(and)-157 4969 y(it)i(is)f(quite)h(lik)n(ely)f(that)h(ev)n(en)f(trust)n(w)n(orth) n(y)f(principals)h(with)-157 5069 y(a)e(v)n(ery)g(go)r(o)r(d)g (reputation)g(migh)n(t)g(not)h(accept)f(it.)36 b(W)-7 b(e)23 b(there-)-157 5169 y(fore)k(assume)g(that)h(complete)f (transparency)f(is)i(not)f(a)h(v)n(ery)-157 5268 y(useful)j(to)r(ol)f (for)f(sup)r(ervision.)44 b(A)31 b(b)r(etter)g(approac)n(h)d(w)n(ould) -157 5368 y(b)r(e)19 b(to)g(designate)f(sp)r(ecialized)h(companies)f (that)h(execute)g(fre-)-157 5467 y(quen)n(t)27 b(in-depth)h(con)n (trols)e(of)i(the)g(conduct)f(of)h(companies.)-74 5571 y(Finally)-7 b(,)32 b(neither)f(of)h(the)f(t)n(w)n(o)g(approac)n(hes)e (can)i(prev)n(en)n(t)-157 5670 y(malicious)24 b(b)r(eha)n(viour,)g(but) h(they)f(only)g(try)h(to)f(comp)r(ensate)1978 36 y(for)c(it)h(after)f (it)h(has)f(b)r(een)h(disco)n(v)n(ered.)33 b(F)-7 b(or)20 b(man)n(y)g(situations)1978 135 y(in)31 b(real-life,)g(where)f(an)h (o\033ence)g(migh)n(t)g(ha)n(v)n(e)e(an)i(irrepara-)1978 235 y(ble)19 b(e\033ect)g(\(e.g.,)i(the)e(collapse)f(of)h(the)g (Barings)f(Bank,)i(where)1978 335 y(the)29 b(Bank)f(o\036cials)g (trusted)h(their)g(trader)f([7)o(]\))h(or)f(where)h(a)1978 434 y(prop)r(er)h(functioning)i(of)g(the)g(system)f(is)g(absolutely)g (essen-)1978 534 y(tial,)c(this)h(guaran)n(tee)e(migh)n(t)h(not)h(b)r (e)g(strong)e(enough.)2061 635 y(W)-7 b(e)32 b(w)n(ould)g(lik)n(e)g(to) h(remark)e(that)h(most)h(of)f(these)g(prob-)1978 735 y(lems)d(are)g(also)g(presen)n(t)g(in)h(our)f(ev)n(ery-da)n(y)e(life)j (and)g(there-)1978 834 y(fore)41 b(quite)i(w)n(ell)f(understo)r(o)r(d.) 81 b(Ho)n(w)n(ev)n(er,)44 b(the)f(question)1978 934 y(stands)27 b(if)h(w)n(e)f(can)g(do)h(b)r(etter)f(than)h(that.)2061 1035 y(The)34 b(p)r(essimistic)h(approac)n(h)e(remo)n(v)n(es)f(all)i (these)h(disad-)1978 1135 y(v)-5 b(an)n(tages)40 b(b)n(y)h(simply)g (prev)n(en)n(ting)f(an)n(y)h(violation)g(of)g(the)1978 1234 y(published)24 b(p)r(olicy)-7 b(.)35 b(This)24 b(w)n(ould)f (clearly)g(b)r(e)h(the)g(b)r(est)g(foun-)1978 1334 y(dation)18 b(for)h(trust)g(since)g(w)n(e)g(can)g(solely)f(rely)g(on)h(a)g (principal's)1978 1434 y(p)r(olicy)28 b(to)g(v)n(erify)f(that)i(its)f (b)r(eha)n(viour)f(will)h(b)r(e)h(acceptable.)1978 1533 y(The)40 b(b)r(eha)n(viour)e(of)i(the)h(principal)e(b)r(ecomes)h (completely)1978 1633 y(transparen)n(t)d(as)g(far)i(as)f(it)h(is)f (constrained)f(b)n(y)i(its)f(p)r(olicy)1978 1733 y(without)27 b(the)h(need)f(to)g(actually)g(sup)r(ervise)f(an)n(y)h(particular)1978 1832 y(action.)36 b(If)27 b(the)g(p)r(olicy)g(prescrib)r(es)f(a)g (particular)g(action)g(for)1978 1932 y(some)20 b(ev)n(en)n(t)g(and)g (if)h(the)g(p)r(olicy)g(is)f(enforced)g(then)h(it)g(is)g(guar-)1978 2031 y(an)n(teed)k(that)h(the)h(action)e(will)h(tak)n(e)f(place.)36 b(Unfortunately)-7 b(,)1978 2131 y(this)29 b(p)r(olicy)g(enforcemen)n (t)f(can)h(not)g(b)r(e)h(realized)e(in)h(its)h(full)1978 2231 y(generalit)n(y)-7 b(,)21 b(but)g(is)g(limited)h(to)f(those)g(p)r (olicies)g(\(or)f(rules)h(of)g(a)1978 2330 y(p)r(olicy\))k(that)g(can)f (e\033ectiv)n(ely)h(b)r(e)g(enforced)f(with)h(some)f(un-)1978 2430 y(circum)n(v)n(en)n(table)h(mec)n(hanism.)36 b(F)-7 b(or)26 b(non-enforceable)f(p)r(oli-)1978 2530 y(cies,)j(w)n(e)g(still) h(ha)n(v)n(e)e(to)i(rely)e(on)i(optimistic)f(approac)n(hes)e(to)1978 2629 y(trust.)2061 2730 y(There)43 b(is)h(no)g(p)r(ossibilit)n(y)g(to)g (enforce)f(rules)h(within)h(a)1978 2830 y(p)r(olicy)35 b(without)g(relying)f(on)h(some)f(piece)h(of)g(trusted)g(and)1978 2930 y(tamp)r(er-pro)r(of)d(hardw)n(are)g([4)o(].)55 b(In)34 b(the)g(follo)n(wing)f(section,)1978 3029 y(w)n(e)28 b(will)h(describ)r(e)f(suc)n(h)g(a)h(piece)f(of)h(hardw)n(are)e(and)h (the)h(re-)1978 3129 y(quiremen)n(ts)23 b(that)i(ha)n(v)n(e)e(to)i(b)r (e)f(met)h(so)f(that)h(it)g(can)f(b)r(e)g(used)1978 3229 y(to)j(enforce)g(certain)g(rules)g(of)g(a)g(p)r(olicy)-7 b(.)1978 3511 y Fz(4)131 b(T)-11 b(amp)t(er-pro)t(of)98 b(hardw)l(are)h(and)2175 3661 y(the)44 b(CryPO)g(proto)t(col)1978 3845 y Fy(W)-7 b(e)20 b(will)g(\034rst)f(presen)n(t)g(the)h(execution)f (en)n(vironmen)n(t)g(\(TPE\))1978 3945 y(that)31 b(w)n(e)g(rely)g(on)g (and)g(then)h(describ)r(e)f(the)g(CryPO)g(\(cryp-)1978 4045 y(tographically)37 b(protected)h(ob)5 b(jects)3127 4015 y Fx(4)3164 4045 y Fy(\))39 b(proto)r(col)f(that)h(uses)1978 4144 y(it.)e(Figure)27 b(1)g(giv)n(es)f(an)h(o)n(v)n(erview)e(of)j(the) g(principals)e(in)i(the)1978 4244 y(system.)2061 4345 y(The)h(TPE)h(man)n(ufacturer)e(pro)r(duces)g(the)h(TPEs,)h(whic)n(h) 1978 4445 y(can)21 b(b)r(e)h(b)r(ough)n(t)f(b)n(y)g(an)n(y)g(agen)n(t)g (executor.)34 b(An)22 b(agen)n(t)f(o)n(wner)1978 4544 y(has)h(to)h(trust)g(the)h(TPE)g(man)n(ufacturer)e(to)h(design)f(and)h (pro-)1978 4644 y(duce)i(its)h(TPEs)g(prop)r(erly)e(\(see)i(Section)f (6\).)36 b(The)26 b(brok)n(er)d(is)1978 4744 y(basically)29 b(a)h(directory)f(service)g(to)h(lo)r(cate)g(the)h(other)f(prin-)1978 4843 y(cipals)d(and)g(to)g(obtain)h(their)f(creden)n(tials.)1978 5084 y Fr(4.1)112 b(Notation)1978 5240 y Fy(The)29 b(describ)r(ed)f (approac)n(h)f(relies)h(on)h(public)g(k)n(ey)f(cryptog-)1978 5339 y(raph)n(y)20 b([5)o(])i(\(suc)n(h)f(as)g(RSA)h([13)o(]\).)35 b(A)21 b(detailed)h(description)e(of)1978 5439 y(cryptograph)n(y)28 b(and)i(the)h(corresp)r(onding)d(notations)i(is)g(not)p 1978 5515 774 4 v 2070 5568 a Ft(4)2105 5592 y Fu(W)-6 b(e)25 b(ha)n(v)n(e)i(originally)e(c)n(hosen)h(the)g(term)f(ob)t(ject)h (since)f(it)g(is)f(more)1978 5670 y(general)h(than)f(the)h(term)e(agen) n(t.)1856 5919 y Fy(5)p eop %%Page: 6 6 6 5 bop 22 1136 a @beginspecial 181 @llx 581 @lly 370 @urx 723 @ury 1890 @rwi @setspecial %%BeginDocument: figs/TPE_archOvw.eps /tgifdict 41 dict def tgifdict begin /tgifellipsedict 6 dict def tgifellipsedict /mtrx matrix put /tgifellipse { tgifellipsedict begin /yrad exch def /xrad exch def /y exch def /x exch def /savematrix mtrx currentmatrix def x y translate xrad yrad scale 0 0 1 0 360 arc savematrix setmatrix end } def /tgifarrowtipdict 8 dict def tgifarrowtipdict /mtrx matrix put /tgifarrowtip { tgifarrowtipdict begin /dy exch def /dx exch def /h exch def /w exch def /y exch def /x exch def /savematrix mtrx currentmatrix def x y translate dy dx atan rotate 0 0 moveto w neg h lineto w neg h neg lineto savematrix setmatrix end } def /tgifpatdict 10 dict def /tgifpatbyte { currentdict /retstr get exch pat i cellsz mod get put } def /tgifpatproc { 0 1 widthlim {tgifpatbyte} for retstr /i i 1 add def } def /tgifpatfill { tgifpatdict begin /h exch def /w exch def /lty exch def /ltx exch def /cellsz exch def /pat exch def /widthlim w cellsz div cvi 1 sub def /retstr widthlim 1 add string def /i 0 def tgiforigctm setmatrix ltx lty translate w h true [1 0 0 1 0 0] {tgifpatproc} imagemask ltx neg lty neg translate end } def /pat3 <8000000008000000> def /pat4 <8800000022000000> def /pat5 <8800220088002200> def /pat6 <8822882288228822> def /pat7 def /pat8 <77dd77dd77dd77dd> def /pat9 <77ffddff77ffddff> def /pat10 <77ffffff77ffffff> def /pat11 <7fffffff7fffffff> def /pat12 <8040200002040800> def /pat13 <40a00000040a0000> def /pat14 def /pat15 def /pat16 def /pat17 <038448300c020101> def /pat18 <081c22c180010204> def /pat19 <8080413e080814e3> def /pat20 <8040201008040201> def /pat21 <8844221188442211> def /pat22 <77bbddee77bbddee> def /pat23 def /pat24 <7fbfdfeff7fbfdfe> def /pat25 <3e1f8fc7e3f1f87c> def /pat26 <0102040810204080> def /pat27 <1122448811224488> def /pat28 def /pat29 <83070e1c3870e0c1> def /pat30 def /pat31 <7cf8f1e3c78f1f3e> def /tgifcentertext { dup stringwidth pop 2 div neg 0 rmoveto } def /tgifrighttext { dup stringwidth pop neg 0 rmoveto } def end tgifdict begin /tgifsavedpage save def 1 setmiterlimit 1 setlinewidth 0 setgray 72 0 mul 72 11.60 mul translate 72 128 div 100.000 mul 100 div dup neg scale gsave /tgiforigctm matrix currentmatrix def % BOX 0 setgray gsave newpath 353 406 moveto 633 406 lineto 633 449 lineto 353 449 lineto closepath 1 setgray fill 0 setgray newpath 353 406 moveto 633 406 lineto 633 449 lineto 353 449 lineto closepath eoclip newpath pat7 8 352 400 288 56 tgifpatfill grestore % BOX 0 setgray newpath 348 399 moveto 628 399 lineto 628 442 lineto 348 442 lineto closepath 1 setgray fill 0 setgray gsave 10 setmiterlimit gsave newpath 348 399 moveto 628 399 lineto 628 442 lineto 348 442 lineto closepath stroke grestore grestore % TEXT 0 setgray /Helvetica findfont [11 0 0 -11 0 0] makefont setfont gsave 377 424 moveto (TM:) tgifrighttext show grestore % TEXT 0 setgray /Helvetica findfont [11 0 0 -11 0 0] makefont setfont gsave 543 424 moveto (AE:) tgifrighttext show grestore % TEXT 0 setgray /Helvetica findfont [11 0 0 -11 0 0] makefont setfont gsave 543 411 moveto (AO:) tgifrighttext show grestore % TEXT 0 setgray /Helvetica findfont [11 0 0 -11 0 0] makefont setfont gsave 377 411 moveto (TPE:) tgifrighttext show grestore % TEXT 0 setgray /Helvetica findfont [11 0 0 -11 0 0] makefont setfont gsave 543 436 moveto (Br:) tgifrighttext show grestore % TEXT 0 setgray /Helvetica findfont 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(\(e.g.,)f(pro-)1978 235 y(tection)h(of)g(agen)n(ts)e(from)i(eac)n(h)f (other\).)44 b(F)-7 b(urthermore,)29 b(the)1978 335 y(TPE)35 b(con)n(tains)e(a)h(priv)-5 b(ate)34 b(k)n(ey)f Fq(K)3112 299 y Fn(\000)p Fm(1)3106 359 y Fj(TPE)3291 335 y Fy(that)i(is)f(kno)n (wn)f(to)1978 434 y(no)f(principal)h(other)f(than)h(the)h(TPE)f(\025)g (also)f(the)h(ph)n(ysical)1978 534 y(o)n(wner)25 b(of)h(the)h(TPE)g (has)f(no)g(information)g(concerning)f(this)1978 634 y(priv)-5 b(ate)32 b(k)n(ey)-7 b(.)53 b(This)32 b(can)h(b)r(e)g(ac)n (hiev)n(ed)f(b)n(y)h(generating)e(the)1978 733 y(priv)-5 b(ate)38 b(k)n(ey)h(on)f(the)i(TPE)2883 703 y Fx(5)2921 733 y Fy(.)f(Using)g(this)g(approac)n(h,)h(the)1978 833 y(k)n(ey)32 b(is)h(nev)n(er)f(a)n(v)-5 b(ailable)32 b(outside)g(of)h (the)h(TPE)g(and,)g(th)n(us,)1978 933 y(protected)i(b)n(y)h(the)h(op)r (erating)e(system)g(and)h(the)h(tamp)r(er-)1978 1032 y(pro)r(ofedness)e(of)i(the)g(TPE.)g(The)g(secrecy)e(of)i(the)g(priv)-5 b(ate)1978 1132 y(k)n(ey)26 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y(Due)h(to)g(its)g(implemen)n (tation)g(as)g(a)g(tamp)r(er-pro)r(of)e(mo)r(d-)1978 2771 y(ule)c(and)h(the)f(restricted)g(access)f(via)h(the)h(op)r (erating)f(system,)1978 2870 y(it)i(is)f(imp)r(ossible)h(to)f(directly) h(access)e(the)i(information)f(that)1978 2970 y(is)k(con)n(tained)g(on) g(the)h(TPE.)2061 3072 y(This)44 b(prop)r(ert)n(y)e(is)i(ensured)f(and) h(guaran)n(teed)e(b)n(y)i(the)1978 3172 y(TPE)j(man)n(ufacturer)d(\()p Fw(TM)14 b Fy(\),)48 b(whic)n(h)d(also)g(pro)n(vides)g(the)1978 3271 y(agen)n(t)h(executor)h(\()p Fw(AE)10 b Fy(\))48 b(with)g(a)f(certi\034cate)g(\(signed)h(b)n(y)1978 3371 y(TM\).)33 b(The)g(certi\034cate)g(con)n(tains)f(information)g(ab)r (out)h(the)1978 3471 y(TPE,)e(suc)n(h)f(as)g(its)h(man)n(ufacturer,)f (its)g(t)n(yp)r(e,)i(the)e(guaran-)1978 3570 y(tees)36 b(pro)n(vided,)i(and)e(its)h(public)g(k)n(ey)-7 b(.)63 b(The)37 b(agen)n(t)f(o)n(wner)1978 3670 y(\()p Fw(A)n(O)8 b Fy(\))37 b(has)f(to)h(trust)h(the)f(TM)h(\(see)f(Section)g(6\))g (that)h(the)1978 3769 y(TPE)51 b(actually)f(do)r(es)g(pro)n(vide)f(the) h(protection)g(that)g(is)1978 3869 y(claimed)27 b(in)h(the)g (certi\034cate.)1978 4115 y Fr(4.3)112 b(CryPO)37 b(proto)s(col)1978 4273 y Fy(The)59 b(CryPO)g(\(cryptographically)e(protected)j(ob)5 b(jects\))1978 4373 y(proto)r(col)17 b(transfers)g(agen)n(ts)g (exclusiv)n(ely)h(in)h(encrypted)f(form)1978 4473 y(o)n(v)n(er)30 b(the)i(net)n(w)n(ork)e(to)h(a)h(TPE.)h(Therefore,)e(it)h(is)g(imp)r (ossi-)1978 4572 y(ble)f(for)f(an)n(y)n(one)g(who)h(do)r(es)f(not)h (kno)n(w)g(the)g(prop)r(er)f(k)n(ey)g(to)1978 4672 y(obtain)d(the)h(co) r(de)f(or)g(data)g(of)g(suc)n(h)h(a)f(protected)g(agen)n(t.)2061 4774 y(The)41 b(proto)r(col)e(is)i(divided)h(in)n(to)e(t)n(w)n(o)g (distinct)i(phases.)1978 4874 y(The)25 b(\034rst)f(phase)h(consists)f (of)h(an)g(initialization,)g(whic)n(h)g(has)1978 4974 y(to)e(b)r(e)h(executed)g(once)f(b)r(efore)g(the)h(actual)f(execution)g (of)h(the)1978 5073 y(proto)r(col.)35 b(The)27 b(second)g(phase)f(is)h 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Fs(\017)41 b Fy(the)74 b(TM)f(sends)g(the)h (certi\034cate)f Fh(Cert)1461 680 y Fj(TPE)1712 668 y Fp(=)9 767 y Fs(f)p Fq(K)122 779 y Fj(TPE)273 767 y Fs(g)315 779 y Fo(S)356 787 y Fg(TM)475 767 y Fy(to)27 b(the)h(AE.)-74 934 y Fs(\017)41 b Fy(the)23 b(AE)g(registers)e(its)i(reference)1045 904 y Fx(6)1104 934 y Fy(with)g(one)f(or)f(sev)n(eral)9 1033 y(brok)n(ers.)22 2383 y @beginspecial 71 @llx 668 @lly 260 @urx 810 @ury 1890 @rwi @setspecial %%BeginDocument: figs/TPE_archInit.eps /tgifdict 41 dict def tgifdict begin /tgifellipsedict 6 dict def tgifellipsedict /mtrx matrix put /tgifellipse { tgifellipsedict begin /yrad exch def /xrad exch def /y exch def /x exch def /savematrix mtrx currentmatrix def x y translate xrad yrad scale 0 0 1 0 360 arc savematrix setmatrix end } def /tgifarrowtipdict 8 dict def tgifarrowtipdict /mtrx matrix put /tgifarrowtip { tgifarrowtipdict begin /dy exch def /dx exch def /h exch def /w exch def /y exch def /x exch def /savematrix mtrx currentmatrix def x y 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56.50 587.00 54.33 4 81 atan dup cos 22.000 mul 641 exch sub exch sin 22.000 mul 57 exch sub curveto tgiforigctm setmatrix 7 setlinewidth flattenpath strokepath clip newpath pat21 8 448 40 200 88 tgifpatfill 1 setlinewidth grestore gsave tgiforigctm setmatrix newpath 641 57 22.000 9.000 81 4 tgifarrowtip 1 setgray closepath fill 0 setgray newpath 641 57 22.000 9.000 81 4 tgifarrowtip closepath eoclip newpath pat21 8 616 40 32 32 tgifpatfill grestore % BOX 0 setgray gsave newpath 675 135 moveto 715 135 lineto 715 140 lineto 675 140 lineto closepath 1 setgray fill 0 setgray newpath 675 135 moveto 715 135 lineto 715 140 lineto 675 140 lineto closepath eoclip newpath pat8 8 672 128 48 16 tgifpatfill grestore % POLYGON/CLOSED-SPLINE 0 setgray newpath 677 68 moveto 667 85 lineto 647 85 lineto 637 68 lineto 647 51 lineto 667 51 lineto closepath gsave 1 setgray eofill grestore gsave stroke grestore % TEXT 0 setgray /Helvetica findfont [11 0 0 -11 0 0] makefont setfont gsave 657 69 moveto (TM) 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(marshal)e(a)g(frozen)h(agen)n(t)g(in)n(to)2144 3001 y(a)k(sequence)g(of)g(b)n(ytes.)1978 3176 y Fi()41 b Fy(the)31 b(TPE)g(pro)n(vides)e(a)h(cryptographic)e(in)n(terface)h (to)2144 3276 y(encrypt)e(a)g(sequence)g(of)h(b)n(ytes)f(with)h(a)f (public)h(k)n(ey)3801 3246 y Fx(8)3837 3276 y Fy(.)1978 3451 y Fi()42 b Fy(the)32 b(TPE)h(pro)n(vides)e(an)h(I/O)f(op)r (eration)g(to)h(send)g(a)2144 3551 y(sequence)27 b(of)g(b)n(ytes)g(to)h (some)f(net)n(w)n(ork)f(address.)2061 3743 y(Apart)31 b(from)g(rule)g(,)h(whic)n(h)f(is)h(a)f(basic)g(rule)g(for)g(al-) 1978 3842 y(most)26 b(an)n(y)h(TPE,)h(all)e(the)i(other)e(rules)g(are)g (regular)f(op)r(erat-)1978 3942 y(ing)h(system)g(functionalit)n(y)g (that)h(is)f(w)n(ell)g(understo)r(o)r(d.)36 b(The)1978 4042 y(rules)30 b(,)g(,)h(and)f()g(that)h(require)f (protection)f(of)1978 4141 y(agen)n(ts)19 b(from)h(one)g(another)f(are) g(readily)g(implemen)n(table)i(us-)1978 4241 y(ing)30 b(normal)g(memory)h(protection)f(mec)n(hanisms.)46 b(The)31 b(ca-)1978 4340 y(pabilit)n(y)25 b(that)i(is)e(required)g(in)i(rules)e (,)h(,)f(and)h()1978 4440 y(can)j(b)r(e)i(a)e(simple)i(random) e(bit-string)g(that)h(is)g(su\036cien)n(tly)1978 4540 y(long)c(to)i(prev)n(en)n(t)f(guessing)f(attac)n(ks)g(from)h(other)g (agen)n(ts.)1978 4784 y Fr(5.2)112 b(The)38 b(send-agen)m(t)g(approac)m (h)1978 4942 y Fy(The)27 b(use)h(of)f(the)h(itineran)n(t)f(safe)h(p)r (olicy)f(to)g(guaran)n(tee)f(that)1978 5041 y(an)20 b(agen)n(t)f(will)i (migrate)e(from)i(a)f(TPE)h Fq(T)3243 5053 y Fm(1)3300 5041 y Fy(to)g(a)f(sp)r(eci\034c)g(TPE)p 1978 5120 774 4 v 2070 5174 a Ft(7)2105 5197 y Fu(The)27 b(agen)n(t)i(that)g(will)d (b)r(e)i(frozen)h(will)d(b)r(e)i(informed)e(ab)r(out)j(this)1978 5276 y(action,)22 b(so)e(that)i(it)f(can)g(p)r(erform)g(an)n(y)g (necessary)i(clean)n(up)e(op)r(erations)1978 5355 y(b)r(efore)j(b)r (eing)g(frozen.)2070 5410 y Ft(8)2105 5434 y Fu(F)-6 b(or)23 b(p)r(erformance)h(reasons,)g(the)g(TPE)e(migh)n(t)g(also)h (use)g(a)g(h)n(ybrid)1978 5513 y(encryption)31 b(sc)n(heme,)f(where)h (it)e(only)g(encrypts)j(a)d(session)g(k)n(ey)h(with)1978 5592 y(the)g(public)g(k)n(ey)h(and)f(the)h(bulk)f(of)f(the)i(data)g (with)f(the)h(session)e(k)n(ey)1978 5670 y(using)23 b(a)h(symmetric)e (encryption)k(sc)n(heme.)1856 5919 y Fy(8)p eop %%Page: 9 9 9 8 bop -157 36 a Fq(T)-108 48 y Fm(2)-41 36 y Fy(is)30 b(no)n(w)g(straigh)n(tforw)n(ard.)42 b(W)-7 b(e)31 b(assume)f(that)g (the)h(orig-)-157 135 y(inal)d(agen)n(t)g Fq(A)292 147 y Fo(O)378 135 y Fy(carries)f(the)i(co)r(de)f(for)h(the)g(send-agen)n (t)e Fq(A)1728 147 y Fo(S)-157 235 y Fy(with)g(it.)37 b Fq(A)208 247 y Fo(O)292 235 y Fy(will)27 b(no)n(w)f(tak)n(e)g(adv)-5 b(an)n(tage)26 b(of)g(rule)h()f(and)-157 335 y()e(to)g(instan)n (tiate)g Fq(A)613 347 y Fo(S)686 335 y Fy(on)h(the)g(TPE)g(\(using)g(a) f(primitiv)n(e)-157 434 y(similar)32 b(to)h Fc(fork)e Fy(on)h(the)i(UNIX)f(op)r(erating)f(system\))h(and)-157 534 y(pro)n(vides)k(it)i(with)g(a)f(capabilit)n(y)g(to)g(access)f(the)i (manage-)-157 634 y(men)n(t)25 b(functionalit)n(y)g(on)g Fq(A)709 646 y Fo(O)791 634 y Fy(as)g(w)n(ell)g(as)f(the)i (certi\034cate)e(for)-157 733 y Fq(T)-108 745 y Fm(2)-71 733 y Fy(,)35 b(whic)n(h)f(con)n(tains)f Fq(T)612 745 y Fm(2)648 733 y Fy('s)h(p)r(olicy)-7 b(,)35 b(the)g(public)f(k)n(ey)f (of)h Fq(T)1717 745 y Fm(2)1753 733 y Fy(,)-157 833 y(and)27 b(a)g(net)n(w)n(ork)g(address)f(for)h Fq(T)862 845 y Fm(2)899 833 y Fy(.)-74 1071 y Fq(A)-12 1083 y Fo(S)77 1071 y Fy(will)41 b(no)n(w)f(tak)n(e)f(the)i(necessary)e(actions)h(to)g (freeze)-157 1171 y Fq(A)-95 1183 y Fo(O)-12 1171 y Fy(\(rule)27 b(\))f(and)h(to)f(marshal)f Fq(A)1047 1183 y Fo(O)1131 1171 y Fy(in)n(to)h(a)h(sequence)f(of)-157 1270 y(b)n(ytes)34 b(\(rule)h(\).)59 b(F)-7 b(or)34 b(this,)j Fq(A)954 1282 y Fo(S)1037 1270 y Fy(needs)e(the)g(capabilit)n(y)-157 1370 y(that)d(it)h(receiv)n(ed)d(from)i Fq(A)700 1382 y Fo(O)757 1370 y Fy(.)50 b(Then)32 b Fq(A)1113 1382 y Fo(S)1193 1370 y Fy(will)h(encrypt)e(the)-157 1469 y(marshaled)23 b Fq(A)299 1481 y Fo(O)381 1469 y Fy(\(rule)i(\))f (using)g(the)i(k)n(ey)e(in)h(the)g(certi\034-)-157 1569 y(cate)31 b(for)g Fq(T)202 1581 y Fm(2)270 1569 y Fy(and)g(send)h(it)f (to)h(the)f(net)n(w)n(ork)f(address)g(giv)n(en)-157 1669 y(in)e(the)g(certi\034cate.)-74 1907 y(In)i(order)e(to)h(guaran)n(tee)f (the)i(liv)n(eness)f(of)g(an)h(agen)n(t)e(that)-157 2006 y(is)h(executing)h(on)f(a)g(TPE,)i(the)f(TPE)h(needs)f(to)f(implemen)n (t)-157 2106 y(some)19 b(form)g(of)g(c)n(hec)n(kp)r(oin)n(ting)f(mec)n (hanism)h(that)g(allo)n(ws)f(the)-157 2206 y(agen)n(t)30 b(to)i(surviv)n(e)e(a)h(p)r(ossible)g(crash)f(of)h(the)h(TPE)g(\(or)f (an-)-157 2305 y(other)f(mec)n(hanism)g(with)h(a)g(similar)f (functionalit)n(y\).)46 b(Solv-)-157 2405 y(ing)37 b(this)h(problem)f (is)h(in)g(itself)g(a)f(complex)g(task)g(and)h(w)n(e)-157 2504 y(will)33 b(not)h(discuss)e(it)i(here)f(an)n(y)f(further.)54 b(Ho)n(w)n(ev)n(er,)32 b(in)i(or-)-157 2604 y(der)g(for)g Fq(A)189 2616 y Fo(S)272 2604 y Fy(to)g(ensure)g(that)h Fq(A)895 2616 y Fo(O)986 2604 y Fy(will)f(actually)g(con)n(tin)n(ue) -157 2704 y(its)c(execution)g(on)g Fq(T)502 2716 y Fm(2)539 2704 y Fy(,)h(it)g(is)f(necessary)f(that)i Fq(A)1381 2716 y Fo(S)1459 2704 y Fy(w)n(aits)f(for)-157 2803 y(a)k (con\034rmation)g(stating)g(that)h Fq(A)944 2815 y Fo(O)1036 2803 y Fy(has)f(successfully)h(cre-)-157 2903 y(ated)29 b(suc)n(h)g(a)f(c)n(hec)n(kp)r(oin)n(t)h(on)f Fq(T)868 2915 y Fm(2)905 2903 y Fy(.)42 b(If)29 b Fq(A)1116 2915 y Fo(S)1194 2903 y Fy(do)r(es)g(not)g(receiv)n(e)-157 3003 y(suc)n(h)f(a)h(message)e(after)h(a)h(certain)f(timeout,)h(it)g (migh)n(t)g(sim-)-157 3102 y(ply)k(re-instan)n(tiate)e Fq(A)566 3114 y Fo(O)655 3102 y Fy(on)h Fq(T)824 3114 y Fm(1)894 3102 y Fy(and)g(inform)h(it)g(ab)r(out)f(the)-157 3202 y(unsuccessful)39 b(migration)g(attempt.)73 b Fq(A)1163 3214 y Fo(O)1259 3202 y Fy(can)39 b(then)h(tak)n(e)-157 3301 y(appropriate)26 b(actions)g(to)i(reco)n(v)n(er)d(from)i(this)h (error.)-74 3539 y(No)g(other)g(agen)n(t)g(on)g Fq(T)666 3551 y Fm(1)731 3539 y Fy(is)h(capable)f(to)g(execute)g(the)h(op-)-157 3639 y(erations)e(that)i(giv)n(e)f(access)g(to)g Fq(A)922 3651 y Fo(O)979 3639 y Fy('s)h(co)r(de)f(or)g(data)g(in)h(an)n(y)-157 3739 y(w)n(a)n(y)22 b(\(rule)h(\).)35 b(F)-7 b(urthermore,)24 b(since)f Fq(T)1217 3751 y Fm(1)1277 3739 y Fy(will)h(nev)n(er)e(dis-) -157 3838 y(close)38 b(an)n(y)g(information)g(on)h(an)n(y)f(agen)n(t)g (executing)h(on)f(it)-157 3938 y(\(rule)26 b(\),)g(the)h(only)f(w)n (a)n(y)f(that)i(an)n(y)f(information)g(ab)r(out)-157 4038 y(an)38 b(agen)n(t)f(on)h(a)g(TPE)h(can)f(ev)n(er)f(b)r(ecome)h(a) n(v)-5 b(ailable)37 b(out-)-157 4137 y(side)45 b(of)g(this)g(TPE)h(is)e (through)g(prop)r(er)g(actions)g(of)h(the)-157 4237 y(agen)n(t)20 b(itself)i(\(b)n(y)f(sending)g(messages)e(or)i(b)n(y)g(using)f(the)i (send-)-157 4336 y(agen)n(t)40 b(approac)n(h)f(for)h(migration\).)75 b(Therefore,)43 b(w)n(e)d(con-)-157 4436 y(clude)22 b(that)h(the)g (presen)n(ted)e(approac)n(h)f(allo)n(ws)h(to)i(guaran)n(tee)-157 4536 y(that)35 b(an)f(agen)n(t)g(will)h(migrate)e(exactly)h(to)h(the)g (next)g(TPE)-157 4635 y(on)f(its)h(itinerary)e(and)i(will,)h(th)n(us,)h (follo)n(w)c(its)i(pre-de\034ned)-157 4735 y(itinerary)-7 b(.)-74 4973 y(T)g(o)42 b(simplify)i(this)f(approac)n(h)e(to)i(agen)n (t)f(mobilit)n(y)-7 b(,)46 b(the)-157 5073 y(co)r(de)31 b(of)g Fq(A)198 5085 y Fo(S)277 5073 y Fy(could)g(also)f(b)r(e)h(in)n (tegrated)f(in)h(the)h(op)r(erating)-157 5172 y(system)j(of)g(the)h (TPE,)h(whic)n(h)e(could)g(o\033er)g(access)f(to)h(this)-157 5272 y(functionalit)n(y)j(in)g(the)h(form)e(of)h(a)g(system)g(call)g (that)g(p)r(er-)-157 5372 y(forms)33 b(the)g(migration)g(\(e.g.)54 b(jump,)36 b(go,)e(etc.\).)55 b(Ho)n(w)n(ev)n(er,)-157 5471 y(the)32 b(underlying)f(p)r(olicy)g(and)g(the)h(necessary)e (actions)g(that)-157 5571 y(are)37 b(required)h(to)g(ac)n(hiev)n(e)f (this,)k(are)c(the)i(ones)f(describ)r(ed)-157 5670 y(ab)r(o)n(v)n(e.) 1978 36 y Fz(6)131 b(T)-11 b(rust)86 b(in)f(the)g(TPE)g(man)l(ufac-) 2175 185 y(turer)1978 373 y Fy(W)-7 b(e)31 b(ha)n(v)n(e)g(just)h(in)n (tro)r(duced)f(the)h(mec)n(hanism,)f(with)h(whic)n(h)1978 473 y(an)24 b(agen)n(t)f(can)h(tak)n(e)g(adv)-5 b(an)n(tage)23 b(of)h(the)h(p)r(olicy)f(enforced)g(b)n(y)1978 572 y(a)k(TPE.)h(Ho)n(w) n(ev)n(er,)e(as)g(w)n(e)h(ha)n(v)n(e)f(men)n(tioned)i(ab)r(o)n(v)n(e,)e (in)i(or-)1978 672 y(der)19 b(for)g(a)g(user)g(to)h(trust)g(in)g(the)g (prop)r(er)e(enforcemen)n(t)h(of)h(this)1978 772 y(p)r(olicy)-7 b(,)20 b(it)g(is)f(necessary)e(that)j(he)f(also)f(trusts)h(the)h(TPE)g (man-)1978 871 y(ufacturer)k(to)g(prop)r(erly)g(design,)g(implemen)n (t,)i(and)f(pro)r(duce)1978 971 y(its)37 b(TPEs.)67 b(Since)37 b(there)g(is)g(no)g(w)n(a)n(y)f(\(to)h(the)h(kno)n(wledge)1978 1070 y(of)31 b(the)h(authors\))f(to)h(enforce)f(a)g(correct)f(b)r(eha)n (viour)g(of)i(the)1978 1170 y(TPE)38 b(man)n(ufacturer,)g(it)f(seems)g (that)g(the)h(presen)n(ted)e(ap-)1978 1270 y(proac)n(h)22 b(simply)i(replaces)e(one)i(required)e(trust)i(relationship)1978 1369 y(with)30 b(another)g(one.)44 b(This)30 b(is)g(a)g(correct)f (observ)-5 b(ation)29 b(from)1978 1469 y(a)j(theoretical)g(p)r(oin)n(t) h(of)g(view.)52 b(Nev)n(ertheless,)33 b(w)n(e)g(b)r(eliev)n(e)1978 1569 y(that)d(this)h(replacemen)n(t)e(of)h(trust)h(in)f(an)g(arbitrary) e(service)1978 1668 y(pro)n(vider)j(with)j(trust)f(in)h(a)e(TPE)j(man)n (ufacturer)c(has)i(sev-)1978 1768 y(eral)28 b(more)g(subtle)i (implications.)41 b(W)-7 b(e)30 b(will)f(brie\035y)g(discuss)1978 1867 y(the)f(follo)n(wing)e(adv)-5 b(an)n(tages)26 b(that)i(w)n(e)f (iden)n(ti\034ed:)2061 2063 y Fs(\017)41 b Fy(b)r(etter)57 b(understanding)f(of)h(securit)n(y)f(and)h(priv)-5 b(acy)2144 2162 y(problems)2061 2341 y Fs(\017)41 b Fy(cen)n(tralized)26 b(con)n(trol)2061 2520 y Fs(\017)41 b Fy(resources)25 b(to)j(build)g(reputation)2061 2698 y Fs(\017)41 b Fy(separation)26 b(of)h(concern)2061 2894 y(The)54 b(TPE)h(man)n(ufacturer)d(is)i(a)g (sp)r(ecialized)f(service)1978 2993 y(pro)n(vider,)23 b(whic)n(h)h(primarily)f(deals)g(in)i(the)f(\034eld)h(of)f(the)g(pro-) 1978 3093 y(vision)18 b(of)i(securit)n(y)e(devices.)34 b(Therefore)18 b(it)i(has)f(a)g(b)r(etter)g(un-)1978 3193 y(derstanding)32 b(of)h(securit)n(y)g(and)g(priv)-5 b(acy)32 b(problems,)i(whic)n(h)1978 3292 y(mak)n(es)g(it)i(a)f(m)n(uc) n(h)g(more)g(capable)f(en)n(tit)n(y)i(to)f(ensure)g(this)1978 3392 y(service)f(since)h(it)g(is)g(more)g(a)n(w)n(are)e(of)i(the)g(p)r (oten)n(tial)g(prob-)1978 3491 y(lems)27 b(and)h(pitfalls.)2061 3594 y(W)-7 b(e)37 b(assume)f(that)h(there)g(will)g(b)r(e)g(relativ)n (ely)e(few)i(TPE)1978 3694 y(man)n(ufacturers)18 b(\(on)i(the)h(order)e (of)h(sev)n(eral)e(h)n(undreds\))i(com-)1978 3793 y(pared)j(to)i(the)f (n)n(um)n(b)r(er)g(of)h(p)r(ossible)f(op)r(erators)e(of)j(the)f(TPE) 1978 3893 y(\(on)d(the)h(order)f(of)g(sev)n(eral)f(millions\).)35 b(This)22 b(mak)n(es)e(the)i(con-)1978 3993 y(trol)c(of)h(their)g(b)r (eha)n(viour)f(m)n(uc)n(h)h(easier)f(for)g(exp)r(ert)h(appraisal)1978 4092 y(organizations.)31 b(Also,)22 b(it)f(is)f(quite)h(conceiv)-5 b(able)20 b(that)g(a)g(TPE)1978 4192 y(man)n(ufacturer)k(migh)n(t)i(in) n(vite)f(external)g(exp)r(erts)g(to)h(con)n(trol)1978 4292 y(its)c(in)n(ternal)g(op)r(eration,)g(in)g(order)f(to)h(obtain)g (a)g(b)r(etter)h(p)r(osi-)1978 4391 y(tion)f(in)h(the)g(mark)n(et)f (\(similar)g(to)h(the)g(approac)n(h)e(for)h(qualit)n(y)1978 4491 y(assurance)30 b(in)j(the)h(ISO-9000)c(or)i(the)h(approac)n(h)d (tak)n(en)j(b)n(y)1978 4590 y(In)n(termind)2338 4560 y Fx(9)2375 4590 y Fy(\).)2061 4693 y(The)26 b(pro)r(duction)g(of)h (TPEs)g(is)f(considered)g(to)g(b)r(e)h(a)f(di\036-)1978 4793 y(cult)e(task)f(\(see)h(Section)g(4.4\).)35 b(Therefore,)23 b(w)n(e)h(assume)f(that)1978 4893 y(it)38 b(will)h(b)r(e)g(undertak)n (en)e(b)n(y)h(ma)5 b(jor)38 b(corp)r(orations,)g(whic)n(h)1978 4992 y(ha)n(v)n(e)29 b(the)j(necessary)d(resources)f(to)j(build)g(a)g (go)r(o)r(d)f(reputa-)1978 5092 y(tion)f(and)g(whic)n(h)h(ha)n(v)n(e)e (an)h(incen)n(tiv)n(e)g(to)g(protect)g(this)h(rep-)1978 5191 y(utation.)37 b(This)28 b(allo)n(ws)f(us)h(to)f(rely)h(on)f(go)r (o)r(d)h(reputation)f(as)1978 5291 y(foundation)g(for)g(trust)h(in)f (the)h(TPE)h(man)n(ufacturer.)p 1978 5357 774 4 v 2070 5410 a Ft(9)2105 5434 y Fu(In)n(termind)45 b(w)n(as)g(ev)l(aluated)h(b) n(y)f(a)g(Big)f(6)h(accoun)n(tan)n(ts)j(\034rm)1978 5513 y(to)36 b(v)n(erify)g(the)h(implemen)n(tation)d(of)i(its)f(priv)l(acy)i (p)r(olicy)-6 b(.)68 b(F)-6 b(or)36 b(fur-)1978 5592 y(ther)49 b(information)g(see)f(press)h(release)h(from)e(June)h(6,)54 b(1997)c(on)1978 5670 y Fb(http://www.intermind.com/)q Fu(.)1856 5919 y Fy(9)p eop %%Page: 10 10 10 9 bop -74 36 a Fy(The)32 b(TPE)i(man)n(ufacturer)d(that)i(is)f(resp) r(onsible)f(for)h(the)-157 135 y(enforcemen)n(t)18 b(of)g(the)h(prop)r (er)f(p)r(olicy)g(rules)g(on)h(the)g(TPE,)g(has)-157 235 y(nothing)31 b(to)g(gain)f(b)n(y)h(not)g(accomplishing)f(its)h (task.)46 b(Since)-157 335 y(the)27 b(TPE)h(will)f(b)r(e)g(op)r(erated) f(indep)r(enden)n(t)i(from)e(the)i(TPE)-157 434 y(man)n(ufacturer)g(b)n (y)i(a)f(completely)g(di\033eren)n(t)h(principal)f(and)-157 534 y(since)j(the)h(TPE)g(man)n(ufacturer)e(has)h(no)g(means)g(to)g (access)-157 634 y(the)j(data)g(that)h(is)f(pro)r(cessed)f(on)h(the)g (TPE)h(\(no)g(ph)n(ysical)-157 733 y(connection\),)28 b(there)f(is)h(no)f(p)r(ossibilit)n(y)h(for)f(the)h(TPE)h(man-)-157 833 y(ufacturer)35 b(to)g(dra)n(w)g(a)g(direct)g(b)r(ene\034t)h(from)g (a)f(TPE)h(that)-157 933 y(do)r(es)27 b(not)h(prop)r(erly)e(enforce)h (its)h(p)r(olicy)1127 902 y Fx(10)1197 933 y Fy(.)-74 1032 y(W)-7 b(e)22 b(assume)f(that)h(the)g(ab)r(o)n(v)n(e)f(argumen)n (ts)f(of)i(high)f(exp)r(er-)-157 1132 y(tise,)g(e\033ectiv)n(e)d(con)n (trollabilit)n(y)-7 b(,)19 b(go)r(o)r(d)f(reputation,)i(and)f(lac)n(k) -157 1231 y(of)34 b(incen)n(tiv)n(e)g(are)g(sound)g(reasons)e(to)i (trust)h(a)f(TPE)h(man-)-157 1331 y(ufacturer)f(to)h(build)g(reliable)f (and)g(p)r(o)n(w)n(erful)g(TPEs.)60 b(The)-157 1431 y(main)26 b(adv)-5 b(an)n(tage)24 b(of)j(the)f(approac)n(h)e(lies)i(in)g(the)h(p) r(ossibilit)n(y)-157 1530 y(to)d(lev)n(erage)e(this)i(trust)g(in)g(the) g(TPE)h(man)n(ufacturer)e(on)n(to)g(a)-157 1630 y(completely)32 b(di\033eren)n(t)g(principal)f(in)h(the)g(role)f(of)h(a)g(service)-157 1730 y(pro)n(vider,)26 b(whic)n(h)-74 1891 y Fs(\017)41 b Fy(do)r(es)c(not)h(ha)n(v)n(e)e(the)i(prop)r(er)f(exp)r(ertise)g(to)g (ensure)g(a)9 1990 y(secure)21 b(op)r(eration)f(of)i(its)f(hardw)n(are) f(and)h(to)h(guaran)n(tee)9 2090 y(the)28 b(protection)f(of)g(the)h (pro)r(cessed)f(data.)-74 2254 y Fs(\017)41 b Fy(is)23 b(quite)h(di\036cult)h(to)e(con)n(trol,)g(due)h(to)g(the)g(sheer)f(n)n (um-)9 2353 y(b)r(er)k(of)h(suc)n(h)f(service)g(pro)n(viders.)-74 2517 y Fs(\017)41 b Fy(has)27 b(no)h(particular)f(reputation)g(\(and)h (therefore)f(none)9 2617 y(to)g(lose\).)-74 2780 y Fs(\017)41 b Fy(migh)n(t)29 b(ha)n(v)n(e)e(short)h(term)h(goals)e(that)i(\(in)h (its)f(p)r(oin)n(t)g(of)9 2880 y(view\))f(justify)g(a)f(p)r(olicy)h (violation.)-74 3041 y(With)67 b(the)g(presen)n(ted)e(approac)n(h,)74 b(suc)n(h)66 b(a)g(service)-157 3141 y(pro)n(vider)17 b(can)h(easily)g(de\034ne)i(the)f(p)r(olicy)f(rules)h(that)g(it)g(w)n (ould)-157 3241 y(lik)n(e)26 b(its)h(TPE)h(to)f(enforce)f(\(b)n(y)g (selecting)h(from)f(the)h(options)-157 3340 y(o\033ered)21 b(b)n(y)h(the)h(TPE)g(man)n(ufacturer\))e(and)h(buy)h(the)f(appro-)-157 3440 y(priate)g(TPE)i(from)f(a)f(reputable)h(TPE)h(man)n(ufacturer.)34 b(The)-157 3539 y(service)39 b(pro)n(vider)g(can)i(then)g(immediately)g (b)r(ene\034t)g(from)-157 3639 y(the)26 b(trust)h(that)f(users)f(ha)n (v)n(e)g(in)i(the)f(TPE)i(man)n(ufacturer)d(of)-157 3739 y(its)i(TPE)h(to)f(con)n(vince)g(them)g(that)h(it)f(will)g(not)h (maliciously)-157 3838 y(abuse)f(an)g(agen)n(t)g(sen)n(t)g(b)n(y)h(the) f(users.)-74 3938 y(With)34 b(this,)h(the)e(approac)n(h)e(fa)n(v)n (ours)h(the)h(op)r(en)g(systems)-157 4038 y(philosoph)n(y)-7 b(,)30 b(where)g(an)n(y)g(principal)g(can)g(p)r(ossibly)g(b)r(ecome) -157 4137 y(a)36 b(pro)n(vider)e(of)i(services.)61 b(Suc)n(h)37 b(a)e(service)g(pro)n(vider)g(sim-)-157 4237 y(ply)f(has)f(to)h(obtain) g(a)g(TPE)h(from)e(some)h(reputable)f(man-)-157 4336 y(ufacturer)i(and)g(can)g(then)h(easily)e(con)n(vince)h(a)g(clien)n(t)g (that)-157 4436 y(the)23 b(clien)n(t's)f(con\034den)n(tial)g (information)g(is)g(su\036cien)n(tly)h(pro-)-157 4536 y(tected.)35 b(Th)n(us,)22 b(it)f(b)r(ecomes)f(m)n(uc)n(h)g(easier)g (for)g(a)g(new)h(service)-157 4635 y(pro)n(vider)26 b(to)h(establish)g (itself)h(in)g(the)g(mark)n(et.)-157 4909 y Fz(7)131 b(Conclusion)-157 5091 y Fy(In)24 b(this)h(pap)r(er,)g(w)n(e)f(ha)n(v)n (e)f(discussed)h(the)h(notion)f(of)g(trust)g(in)-157 5190 y(the)35 b(con)n(text)g(of)g(mobile)g(agen)n(t)f(systems)h(and)g (in)n(tro)r(duced)-157 5290 y(a)28 b(structuring)f(for)g(this)h (problem)g(domain.)38 b(Starting)27 b(from)p -157 5357 774 4 v -95 5410 a Ft(10)-30 5434 y Fu(There)d(is)e(the)i(p)r (ossibilit)n(y)e(that)i(a)f(TPE)g(op)r(erator)i(brib)r(es)f(a)f(TPE) -157 5513 y(man)n(ufacturer)36 b(to)e(pro)n(vide)i(an)f(incorrect)h (TPE.)e(W)-6 b(e)35 b(assume)e(that)-157 5592 y(suc)n(h)25 b(a)g(b)r(eha)n(viour)h(is)e(a)h(sev)n(ere)h(o\033ence)g(that)g(is)e (sub)t(ject)h(to)h(criminal)-157 5670 y(in)n(v)n(estigation)f(and)f (not)g(within)g(the)g(scop)r(e)h(of)e(this)h(discussion.)1978 36 y Fy(this)g(structure,)h(w)n(e)f(ha)n(v)n(e)f(prop)r(osed)h(an)g (approac)n(h)e(that)j(re-)1978 135 y(lies)j(on)g(trusted)h(and)f(tamp)r (er-pro)r(of)f(hardw)n(are,)g(whic)n(h)h(al-)1978 235 y(lo)n(ws)h(to)h(prev)n(en)n(t)g(malicious)g(b)r(eha)n(viour)f(rather)g (than)i(cor-)1978 335 y(rect)20 b(it.)34 b(W)-7 b(e)21 b(b)r(eliev)n(e)f(this)g(to)h(b)r(e)f(the)h(b)r(etter)f(form)g(of)g (protec-)1978 434 y(tion)i(for)f(con\034den)n(tial)g(data.)35 b(W)-7 b(e)22 b(ha)n(v)n(e)e(sho)n(wn)i(ho)n(w)f(the)h(ap-)1978 534 y(proac)n(h)h(can)i(b)r(e)g(used)g(to)g(e\033ectiv)n(ely)g(protect) f(the)i(itinerary)1978 634 y(of)31 b(a)g(mobile)h(agen)n(t.)48 b(Finally)-7 b(,)33 b(w)n(e)e(iden)n(ti\034ed)h(the)g(p)r(ositiv)n(e) 1978 733 y(implications)25 b(that)g(the)h(presen)n(ted)e(approac)n(h)g (can)h(ha)n(v)n(e)f(on)1978 833 y(the)h(construction)g(of)g(op)r(en)h (mobile)f(agen)n(t)g(systems,)g(where)1978 933 y(an)n(y)33 b(principal)h(can)g(b)r(ecome)h(a)f(service)f(pro)n(vider)g(and)h(re-) 1978 1032 y(ceiv)n(e)27 b(mobile)g(agen)n(ts.)2061 1132 y(In)36 b(real-life,)h(there)f(are)g(limitations)g(to)g(the)g(approac)n (h.)1978 1231 y(Giv)n(en)c(su\036cien)n(t)h(time)g(and)g(resources,)f (a)g(TPE)i(op)r(erator)1978 1331 y(migh)n(t)j(succeed)h(in)g(breaking)f (the)h(system)g(and)f(it)i(w)n(ould)1978 1431 y(th)n(us)25 b(b)r(e)g(p)r(ossible)g(for)g(him)g(to)g(violate)g(ev)n(en)f(those)h (parts)f(of)1978 1530 y(the)31 b(p)r(olicy)h(that)g(should)f(b)r(e)h (enforced)e(b)n(y)i(the)f(TPE.)i(Our)1978 1630 y(goal)28 b(is)h(to)h(mak)n(e)f(this)g(approac)n(h)f(so)h(costly)g(that)h(it)g(w) n(ould)1978 1730 y(negate)i(a)h(p)r(ossible)g(gain)g(\(there)g(ma)n(y)g (b)r(e)h(man)n(y)e(di\033eren)n(t)1978 1829 y(implemen)n(tations)26 b(of)i(TPEs)f(that)h(pro)n(vide)e(di\033eren)n(t)h(secu-)1978 1929 y(rit)n(y)19 b(guaran)n(tees\).)33 b(As)20 b(further)g(deterren)n (t,)h(w)n(e)f(assume)f(that)1978 2028 y(a)24 b(non-repudiable)g(pro)r (of)g(for)g(a)h(p)r(olicy)f(violation)g(of)h(an)g(en-)1978 2128 y(forced)19 b(p)r(olicy)h(or)f(of)h(an)f(attempted)i(or)e (successful)h(breaking)1978 2228 y(of)j(a)g(TPE)h(migh)n(t)f(b)r(e)h (punished)f(m)n(uc)n(h)g(more)g(sev)n(erely)e(than)1978 2327 y(a)30 b(mere)h(p)r(olicy)g(violation)f(since)h(it)g(pro)n(v)n(es) f(a)g(m)n(uc)n(h)h(larger)1978 2427 y(determination)c(to)g(commit)h(a)f (criminal)g(o\033ence.)1978 2674 y Fz(References)2013 2819 y Fu([1])41 b(R.)26 b(Anderson)i(and)g(M.)e(Kuhn.)41 b(T)-6 b(amp)r(er)27 b(resistance)h(\026)f(a)g(cau-)2129 2898 y(tionary)e(note.)31 b(In)24 b Fa(The)i(Se)l(c)l(ond)g(USENIX)g(W) -5 b(orkshop)27 b(on)e(Ele)l(c-)2129 2977 y(tr)l(onic)g(Commer)l(c)l(e) h(Pr)l(o)l(c)l(e)l(e)l(dings)p Fu(,)f(pages)f(1\02511,)g(Oakland,)f (Cali-)2129 3056 y(fornia,)g(No)n(v)n(em)n(b)r(er)i(1996.)2013 3162 y([2])41 b(G.)19 b(Brassard.)24 b Fa(Mo)l(dern)f(Cryptolo)l(gy)e (\025)h(A)f(T)-5 b(utorial)p Fu(,)20 b(v)n(olume)e(325)2129 3241 y(of)29 b Fa(L)l(e)l(ctur)l(e)j(Notes)f(in)g(Computer)h(Scienc)l (e)p Fu(.)49 b(Springer)32 b(V)-6 b(erlag,)2129 3320 y(1988.)2013 3426 y([3])41 b(A.)26 b(Carzaniga,)j(G.)e(P)-6 b(.)26 b(Picco,)i(and)g(G.)e(Vigna.)41 b(Designing)27 b(dis-)2129 3505 y(tributed)42 b(applications)f(with)f(mobile)f(co)r (de)i(paradigms.)80 b(In)2129 3584 y(R.T)-6 b(a)n(ylor,)43 b(editor,)h Fa(Pr)l(o)l(c)l(e)l(e)l(dings)f(of)d(the)g(19th)h (International)2129 3663 y(Confer)l(enc)l(e)20 b(on)g(Softwar)l(e)g (Engine)l(ering)g(\(ICSE'97\))p Fu(,)f(pages)f(22\025)2129 3742 y(32.)24 b(A)n(CM)f(Press,)g(1997.)2013 3848 y([4])41 b(D.)18 b(M.)f(Chess,)j(B.)e(Grosof,)i(C.)e(G.)g(Harrison,)i(D.)e (Levine,)i(C.)e(P)n(ar-)2129 3927 y(ris,)31 b(and)g(G.)f(T)-6 b(sudik.)51 b(Itineran)n(t)32 b(agen)n(ts)g(for)e(mobile)f(comput-)2129 4006 y(ing.)20 b Fa(IEEE)g(Personal)h(Communic)l(ations)p Fu(,)e(2\(3\):34\02549,)h(Octob)r(er)2129 4085 y(1995.)2013 4192 y([5])41 b(W.)25 b(Di\036e)g(and)g(M.)f(E.)h(Hellman.)34 b(New)25 b(directions)i(in)d(cryptog-)2129 4270 y(raph)n(y)-6 b(.)62 b Fa(IEEE)36 b(T)-5 b(r)l(ans.)35 b(Inform.)g(The)l(ory)p Fu(,)i(IT-22\(6\):644\025654,)2129 4349 y(1976.)2013 4456 y([6])k(DoD.)24 b(Trusted)c(Computer)g(System)g(Ev)l(aluation)g (Criteria)g(\(TC-)2129 4535 y(SEC\).)47 b(T)-6 b(ec)n(hnical)30 b(Rep)r(ort)g(DoD)f(5200.28-STD,)g(Departmen)n(t)2129 4613 y(of)23 b(Defense,)h(Decem)n(b)r(er)g(1985.)2013 4720 y([7])41 b(The)24 b(Economist.)31 b(The)24 b(collapse)g(of)f (Barings,)h(Marc)n(h)g(4)g(1995.)2013 4826 y([8])41 b(J.)27 b(Gosling)g(and)g(H.)g(McGilton.)41 b(The)28 b(ja)n(v)l(a)f(language)h (en)n(viron-)2129 4905 y(men)n(t.)j(White)24 b(pap)r(er,)h(Sun)f (Microsystems,)f(Inc.,)g(1996.)2013 5012 y([9])41 b(R.S.)26 b(Gra)n(y)-6 b(.)41 b(Agen)n(t)28 b(Tcl:)37 b(A)26 b(transp)r(ortable)k (agen)n(t)e(system.)40 b(In)2129 5091 y Fa(Pr)l(o)l(c)l(e)l(e)l(dings) 31 b(of)e(the)g(CIKM)g(W)-5 b(orkshop)30 b(on)g(Intel)t(ligent)e (Infor-)2129 5170 y(mation)e(A)l(gents)p Fu(,)d(Baltimore,)g(MD,)f (Decem)n(b)r(er)j(1995.)1978 5276 y([10])41 b(C.)25 b(G.)h(Harrison,)h (D.)f(M.)f(Chess,)h(and)h(A.)e(Kershen)n(baum.)39 b(Mo-)2129 5355 y(bile)e(agen)n(ts:)60 b(Are)38 b(they)h(a)e(go)r(o)r(d)i(idea?) 109 b(In)38 b(J.)f(Vitek)h(and)2129 5434 y(C.)21 b(T)-6 b(sc)n(h)n(udin,)22 b(editors,)g Fa(Mobile)i(Obje)l(ct)e(Systems:)31 b(T)-5 b(owar)l(ds)25 b(the)2129 5513 y(Pr)l(o)l(gr)l(ammable)k (Internet)p Fu(,)c(v)n(olume)f(1222)i(of)e Fa(L)l(e)l(ctur)l(e)j(Notes) g(on)2129 5592 y(Computer)20 b(Scienc)l(e)p Fu(,)c(pages)h(25\02547.)h (Springer,)h(1997.)h(Also)c(a)n(v)l(ail-)2129 5670 y(able)24 b(as)f(IBM)h(T)-6 b(ec)n(hnical)24 b(Rep)r(ort)i(R)n(C)d(19887.)1836 5919 y Fy(10)p eop %%Page: 11 11 11 10 bop -157 36 a Fu([11])41 b(ITU.)59 b Fa(ITU-T)36 b(R)l(e)l(c)l(ommendation)g(X.509:)52 b(The)34 b(Dir)l(e)l(ctory)g (\025)-6 115 y(A)n(uthentic)l(ation)23 b(F)-5 b(r)l(amework)p Fu(.)27 b(In)n(ternational)c(T)-6 b(elecomm)n(unica-)-6 194 y(tion)24 b(Union,)f(1993.)-157 306 y([12])41 b(J.)19 b(Ordille.)k(When)d(agen)n(ts)g(roam,)f(who)h(can)f(y)n(ou)h(trust?)36 b(T)-6 b(ec)n(hni-)-6 385 y(cal)19 b(Rep)r(ort)i(T)-6 b(ec)n(hnical)20 b(Rep)r(ort,)h(Computing)e(Science)i(Researc)n(h)-6 463 y(Cen)n(ter,)k(Bell)e(Labs,)h(1996.)-157 576 y([13])41 b(RSA)36 b(Data)h(Securit)n(y)-6 b(,)40 b(Inc.)69 b Fa(PK)n(CS)37 b(#1:)56 b(RSA)37 b(Encryption)-6 654 y(Standar)l(d)p Fu(.)c(RSA)23 b(Data)i(Securit)n(y)-6 b(,)25 b(Inc.,)f(No)n(v)n(em)n(b) r(er)g(1993.)-157 766 y([14])41 b(R.)30 b(A.)g(Ruepp)r(el.)53 b(A)31 b(formal)e(approac)n(h)k(to)f(securit)n(y)g(arc)n(hitec-)-6 845 y(tures.)49 b(In)30 b Fa(Eur)l(oCrypt)p Fu(,)h(pages)f(387\025398,) j(Brigh)n(ton,)e(England,)-6 924 y(1991.)-157 1036 y([15])41 b(B.)17 b(Sc)n(hneier.)23 b Fa(Applie)l(d)f(crypto)l(gr)l(aphy)p Fu(.)g(Wiley)-6 b(,)19 b(New)e(Y)-6 b(ork,)20 b(1994.)-157 1148 y([16])41 b(J.)21 b(G.)f(Steiner,)i(C.)e(Neuman,)h(and)g(J.)f(I.)h (Sc)n(hiller.)26 b(Kerb)r(eros:)31 b(An)-6 1227 y(authen)n(tication)e (service)f(for)e(op)r(en)h(net)n(w)n(ork)h(systems.)38 b(In)27 b Fa(Pr)l(o-)-6 1306 y(c)l(e)l(e)l(dings)32 b(of)f(the)g (USENIX)g(Winter)g(1988)h(T)-5 b(e)l(chnic)l(al)32 b(Confer-)-6 1385 y(enc)l(e)p Fu(,)18 b(pages)g(191\025202.)h(USENIX)e(Asso)r (ciation,)h(Berk)n(eley)-6 b(,)20 b(USA,)-6 1464 y(F)-6 b(ebruary)26 b(1988.)-157 1576 y([17])41 b(New)16 b(Y)-6 b(ork)17 b(Times.)h(U.S.)d(w)n(ork)n(ers)j(stole)e(data)h(on)g(11,000,) h(agency)-6 1655 y(sa)n(ys,)23 b(April)h(6,)f(1996.)1978 36 y([18])41 b(G.)29 b(Vigna.)48 b(Protecting)31 b(mobile)d(agen)n(ts)j (through)g(tracing.)50 b(In)2129 115 y Fa(Pr)l(o)l(c)l(e)l(e)l(dings)26 b(of)f(the)f(Thir)l(d)h(W)-5 b(orkshop)26 b(on)f(Mobile)f(Obje)l(ct)f (Sys-)2129 194 y(tems)p Fu(,)g(Finland,)g(June)i(1997.)1978 306 y([19])41 b(J.)32 b(E.)f(White.)57 b(T)-6 b(elescript)33 b(tec)n(hnology:)50 b(The)32 b(foundation)h(for)2129 385 y(the)24 b(electronic)h(mark)n(et)f(place.)31 b(White)24 b(pap)r(er,)g(General)h(Magic,)2129 463 y(Inc.,)f(1994.)1978 576 y([20])41 b(U.)32 b(G.)h(Wilhelm,)g(L.)g(Butt)n(y)n(\340n,)j(and)e (S.)e(Staamann.)59 b(On)33 b(the)2129 654 y(problem)26 b(of)g(trust)i(in)e(mobile)f(agen)n(t)j(systems.)39 b(In)27 b Fa(Symp)l(osium)2129 733 y(on)d(Network)g(and)h(Distribute)l(d)e (System)h(Se)l(curity)p Fu(.)d(In)n(ternet)j(So-)2129 812 y(ciet)n(y)-6 b(,)24 b(Marc)n(h)h(1998.)32 b(\(to)24 b(app)r(ear\).)1978 924 y([21])41 b(I.)23 b(S.)f(Winkler.)30 b(The)23 b(non-tec)n(hnical)i(threat)g(to)e(computing)g(sys-)2129 1003 y(tems.)35 b Fa(Computing)27 b(Systems,)g(USENIX)h(Asso)l(ciation) p Fu(,)e(9\(1\):3\025)2129 1082 y(14,)e(Win)n(ter)h(1996.)1978 1194 y([22])41 b(T.)35 b(Y.)f(C.)h(W)-6 b(o)r(o)37 b(and)f(S.)f(S.)g (Lam.)65 b(Authen)n(tication)37 b(for)f(dis-)2129 1273 y(tributed)28 b(systems.)40 b Fa(IEEE)30 b(Computer)p Fu(,)e(25\(1\):39\02552,)h(Jan)n(uary)2129 1352 y(1992.)1978 1464 y([23])41 b(P)-6 b(.)29 b(Zimmermann.)45 b Fa(PGP)31 b(User's)g(Guide)p Fu(.)48 b(MIT)29 b(Press,)i(Cam-)2129 1543 y(bridge,)24 b(1994.)1836 5919 y Fy(11)p eop %%Trailer end userdict /end-hook known{end-hook}if %%EOF