⟦ced766fcf⟧

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/GlSave save def /TeXDict 200 dict def TeXDict begin /Resolution 300 def /Inch
{Resolution mul}def /Mtrx 6 array def /letter where{pop}{/letter{}def}ifelse
/legal where{pop}{/legal{}def}ifelse /note where{pop}{/note{}def}ifelse
/@letter{72 Resolution div dup neg scale 310 -3005 translate Mtrx
currentmatrix pop}def /@landscape{letter initmatrix 72 Resolution div dup neg
scale Mtrx currentmatrix 0 0.0 put Mtrx 1 -1.0 put Mtrx 2 1.0 put Mtrx 3 0.0
put Mtrx setmatrix 300 310 translate Mtrx currentmatrix pop}def /@legal{legal
initmatrix 72 Resolution div dup neg scale 295 -3880 translate Mtrx
currentmatrix pop}def /@copies{/#copies exch def}def /@restore /restore load
def /restore{vmstatus pop dup @VMused lt{pop @VMused}if exch pop exch @restore
/@VMused exch def}def /@pri{( )print(                                       )
cvs print}def /@FontMatrix[1 0 0 -1 0 0]def /@FontBBox[0 0 1 1]def /dmystr
(ZZf@@)def /newname{dmystr cvn}def /df{/fontname exch def dmystr 2 fontname
cvx(@@@)cvs putinterval newname 7 dict def newname load begin /FontType 3 def
/FontMatrix @FontMatrix def /FontBBox @FontBBox def /BitMaps 256 array def
/BuildChar{CharBuilder}def /Encoding 256 array def 0 1 255{Encoding exch
/.undef put}for end fontname{/foo setfont}2 array copy cvx def fontname load 0
dmystr 5 string copy cvn cvx put}def /dfend{newname newname load definefont
setfont}def /ch-image{ch-data 0 get}def /ch-width{ch-data 1 get}def /ch-height
{ch-data 2 get}def /ch-xoff{ch-data 3 get}def /ch-yoff{ch-data 4 get}def
/ch-tfmw{ch-data 5 get}def /CharBuilder{save 3 1 roll exch /BitMaps get exch
get /ch-data exch def ch-data null ne{ch-tfmw 0 ch-xoff neg ch-yoff neg
ch-width ch-xoff sub ch-height ch-yoff sub setcachedevice ch-width ch-height
true[1 0 0 1 ch-xoff ch-yoff]{ch-image}imagemask}if restore}def /dc{/ch-code
exch def dup 0 get length 2 lt{pop[<00>1 1 0 0 8.00]}if /ch-data exch def
newname load /BitMaps get ch-code ch-data put newname load /Encoding get
ch-code dup(   )cvs cvn put}def /bop{erasepage initgraphics Mtrx setmatrix
/SaveImage save def 0 0 moveto}def /eop{showpage SaveImage restore}def /@start
{@letter vmstatus pop /@VMused exch def pop}def /@end{(VM used: )print @VMused
@pri(. Unused: )print vmstatus @VMused sub @pri pop pop(\n)print flush end
GlSave restore}def /p{show}def /v{/dy exch neg def /dx exch def /x1
currentpoint /y1 exch def def newpath x1 y1 moveto dx 0 rlineto 0 dy rlineto
dx neg 0 rlineto closepath fill x1 y1 moveto}def /li{lineto}def /rl{rlineto}
def /rc{rcurveto}def /np{/SaveX currentpoint /SaveY exch def def newpath}def
/st{stroke SaveX SaveY moveto}def /fi{fill SaveX SaveY moveto}def /dot{/myY
exch def /myX exch def /deltax currentlinewidth 2 div def np myX deltax sub
myY moveto myX deltax add myY lineto st}def /ellipse{/endangle exch def
/startangle exch def /yrad exch def /xrad exch def /myY exch def /myX exch def
/savematrix matrix currentmatrix def myX myY translate xrad yrad scale 0 0 1
startangle endangle arc savematrix setmatrix}def /a{moveto}def /delta 0 def /b
{exch p dup /delta exch def 0 rmoveto}def /c{p delta 4 sub dup /delta exch def
0 rmoveto}def /d{p delta 3 sub dup /delta exch def 0 rmoveto}def /e{p delta 2
sub dup /delta exch def 0 rmoveto}def /f{p delta 1 sub dup /delta exch def 0
rmoveto}def /g{p delta 0 rmoveto}def /h{p delta 1 add dup /delta exch def 0
rmoveto}def /i{p delta 2 add dup /delta exch def 0 rmoveto}def /j{p delta 3
add dup /delta exch def 0 rmoveto}def /k{p delta 4 add dup /delta exch def 0
rmoveto}def /l{p -4 0 rmoveto}def /m{p -3 0 rmoveto}def /n{p -2 0 rmoveto}def
/o{p -1 0 rmoveto}def /q{p 1 0 rmoveto}def /r{p 2 0 rmoveto}def /s{p 3 0
rmoveto}def /t{p 4 0 rmoveto}def /w{0 rmoveto}def /x{0 exch rmoveto}def /y{3
-1 roll p moveto}def /bos{/section save def}def /eos{section restore}def
/@SpecialDefaults{/hs 8.5 Inch def /vs 11 Inch def /ho 0 def /vo 0 def /hsc 1
def /vsc 1 def /CLIP false def}def /@hsize{/hs exch def /CLIP true def}def
/@vsize{/vs exch def /CLIP true def}def /@hoffset{/ho exch def}def /@voffset{
/vo exch def}def /@hscale{/hsc exch def}def /@vscale{/vsc exch def}def
/@setclipper{hsc vsc scale CLIP{newpath 0 0 moveto hs 0 rlineto 0 vs rlineto
hs neg 0 rlineto closepath clip}if}def /@beginspecial{gsave /SpecialSave save
def currentpoint transform initgraphics itransform translate @SpecialDefaults
@MacSetUp}def /@setspecial{MacDrwgs{md begin /pxt ho def /pyt vo neg def end}{
ho vo translate @setclipper}ifelse}def /@endspecial{SpecialSave restore
grestore}def /MacDrwgs false def /@MacSetUp{userdict /md known{userdict /md
get type /dicttype eq{md begin /letter{}def /note{}def /legal{}def /od{txpose
1 0 mtx defaultmatrix dtransform exch atan/pa exch def newpath clippath mark{
transform{itransform moveto}}{transform{itransform lineto}}{6 -2 roll
transform 6 -2 roll transform 6 -2 roll transform{itransform 6 2 roll
itransform 6 2 roll itransform 6 2 roll curveto}}{{closepath}}pathforall
newpath counttomark array astore /gc xdf pop ct 39 0 put 10 fz 0 fs 2
F/|______Courier fnt invertflag{PaintBlack}if}def /txpose{pxs pys scale ppr
aload pop por{noflips{pop exch neg exch translate pop 1 -1 scale}if xflip
yflip and{pop exch neg exch translate 180 rotate 1 -1 scale ppr 3 get ppr 1
get neg sub neg ppr 2 get ppr 0 get neg sub neg translate}if xflip yflip not
and{pop exch neg exch translate pop 180 rotate ppr 3 get ppr 1 get neg sub neg
0 translate}if yflip xflip not and{ppr 1 get neg ppr 0 get neg translate}if}{
noflips{translate pop pop 270 rotate 1 -1 scale}if xflip yflip and{translate
pop pop 90 rotate 1 -1 scale ppr 3 get ppr 1 get neg sub neg ppr 2 get ppr 0
get neg sub neg translate}if xflip yflip not and{translate pop pop 90 rotate
ppr 3 get ppr 1 get neg sub neg 0 translate}if yflip xflip not and{translate
pop pop 270 rotate ppr 2 get ppr 0 get neg sub neg 0 exch translate}if}ifelse
scaleby96{ppr aload pop 4 -1 roll add 2 div 3 1 roll add 2 div 2 copy
translate .96 dup scale neg exch neg exch translate}if}def /cp{pop pop
showpage pm restore}def end}if}if}def /psf$TeXscale{65536 div}def
/DocumentInitState[matrix currentmatrix currentlinewidth currentlinecap
currentlinejoin currentdash currentgray currentmiterlimit]cvx def /startTexFig
{/psf$SavedState save def userdict maxlength dict begin currentpoint transform
DocumentInitState setmiterlimit setgray setdash setlinejoin setlinecap
setlinewidth setmatrix itransform moveto /psf$ury exch psf$TeXscale def
/psf$urx exch psf$TeXscale def /psf$lly exch psf$TeXscale def /psf$llx exch
psf$TeXscale def /psf$y exch psf$TeXscale def /psf$x exch psf$TeXscale def
currentpoint /psf$cy exch def /psf$cx exch def /psf$sx psf$x psf$urx psf$llx
sub div def /psf$sy psf$y psf$ury psf$lly sub div def psf$sx psf$sy scale
psf$cx psf$sx div psf$llx sub psf$cy psf$sy div psf$ury sub translate
/DefFigCTM matrix currentmatrix def /initmatrix{DefFigCTM setmatrix}def
/defaultmatrix{DefFigCTM exch copy}def /initgraphics{DocumentInitState
setmiterlimit setgray setdash setlinejoin setlinecap setlinewidth setmatrix
DefFigCTM setmatrix}def /showpage{initgraphics}def /erasepage{initgraphics}
def /copypage{}def}def /clipFig{currentpoint 6 2 roll newpath 4 copy 4 2 roll
moveto 6 -1 roll exch lineto exch lineto exch lineto closepath clip newpath
moveto}def /doclip{psf$llx psf$lly psf$urx psf$ury clipFig}def /endTexFig{end
psf$SavedState restore}def end statusdict /waittimeout 300 put

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y(message)e(receiv)o(es)h(authen)o(ticated)g(information)f(from)h(the)h(trust\
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o(el)f(\(to)i(a)o(v)o(oid)d(an)o(y)h(problems)f(with)i(malicious)e fm(MT)l
(A)p fk(s\).)1271 2176 y f3(2)1317 2194 y fk(An)o(y)h(adv)o(ersary)g(listenin\
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53 825 y(explored)f(in)g(greater)g(detail)h(at)g(the)g(end)g(of)g(the)g(pap)q
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f(agen)o(ts)g(do)g(not)h(directly)g(comm)o(unicate)e(with)i(eac)o(h)f(other)
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f(wire)g(b)q(et)o(w)o(een)53 2498 y(the)j(source)g fm(MT)l(A)g fk(and)g(the)h
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w 2 9 v 854 w 2 9 v 257 w 2 9 v 265 100 a 2 50 v 291 85 a fi(Abbrev.)523 100 y
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265 118 a 2 9 v 258 w 2 9 v 854 w 2 9 v 257 w 2 9 v 265 168 a 2 50 v 341 154 a
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y 2 50 v 1456 154 a(DES)1634 168 y 2 50 v 265 218 a 2 50 v 323 203 a(CBMS)523
218 y 2 50 v 550 203 a(Computer)e(Based)h(Message)g(System)1377 218 y 2 50 v
257 w 2 50 v 265 268 a 2 50 v 338 253 a(CKD)523 268 y 2 50 v 550 253 a(Key)g
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582 y(indicating)c(that)h(the)g(ciphertext)h(v)o(ersion)e(of)h(the)g(message)
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y(Finally)l(,)d(the)i ff(tma)g fk(program)d(is)i(used)g(to)h(manipulate)e(the)
i fm(TMA)f fk(database,)g(con)o(taining)53 797 y(commands)i(to)j(b)q(o)q(ot)g
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(the)h fm(TMA)f fk(database.)28 b(This)17 b(program)g(can)53 918 y(also)h(b)q
(e)h(used)f(to)h(disconnect)g(KKs)f(b)q(et)o(w)o(een)h(other)f fm(TMA)p fk
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(a)i(transcript)e(of)i(an)f fm(MH)g fk(session.)53 1193 y fd(Rema)o(rks)171
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171 1593 y fk(It)k(can)h(b)q(e)f(argued)g(that)g(the)h(protot)o(yp)q(e)f(syst\
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q(eci\014c)53 1929 y(attributes,)d(suc)o(h)f(as)h(naming,)f(addressing,)g(and)
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(in)o(terfacing)h(a)g fm(T)l(rusted)g(Mail)i fk(system,)e(no)g(mo)q(di\014cat\
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2539 y(all)c(k)o(ey)h(managemen)o(t)f(is)g(automatic.)21 b(Not)15 b(only)f
(do)q(es)f(this)h(reduce)f(the)h(risk)g(of)g(compromise)g eop bop 69 -50 a fn
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1257 y(breaking)15 b(a)i(k)o(ey)l(,)f(but)h(with)f(longer)g(cryptop)q(erio)q
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g(k)o(ey)h(distribution)e(serv)o(er.)171 1411 y(A)22 b(fundamen)o(tal)e(issue\
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53 1472 y(en)o(vironmen)o(ts,)14 b(is)i(that)h(the)g fm(KDS)e fk(implemen)o
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f(and)g(EFT)g(views)h(of)g(a)g ff(key)h(distribution)h(c)m(enter)e fk(\(in)f
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(database,)f ff(p)m(ost)j fk(treats)e(this)g(as)g(an)g(address)e(v)o(eri\014c\
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b(from)g fr(Pr)n(o)n(c)n(e)n(e)n(dings,)j(Se)n(c)n(ond)f(International)g(Symp)
n(osium)f(on)g(Computer)h(Message)f(Systems)p fn(,)e fz(1985)211 b fk(17)53 65
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280 y(is)h(presen)o(t.)20 b(Since)15 b(the)h fp(ansi)e fk(draft)p fq([FIKM])h
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(,)53 340 y(the)g fm(T)l(rusted)g(Mail)h fk(protot)o(yp)q(e)f(should)f(p)q
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(adv)o(ersary)g(to)h(ascertain)g(subscrib)q(ers)d(to)k(the)f fm(KDS)p fk(,)f
(and)h(p)q(erhaps)f(deduce)171 1565 y(some)17 b(information)g(ab)q(out)i(the)
g(system.)27 b(Without)19 b(kno)o(wledge)f(of)h(the)f(master)g(k)o(ey)171 1626
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(assumes)f(that)j(the)171 1747 y(database)15 b(main)o(tained)g(b)o(y)h(the)h
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171 1961 y(used)f(to)h(a)o(v)o(oid)f(encrypting)h(the)g(b)q(o)q(dy)g(of)h(a)f
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(b)q(eing)g(prepared)f(for)h(encryption,)171 2237 y(a)h(single)g(KD/IV/KA)g
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(the)h(sender)171 2297 y(has)k(a)h(di\013eren)o(t)f(k)o(ey)i(relationship)d
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(di\013eren)o(t,)e(since)g(the)h(structure)e fh(m)i fk(dep)q(ends)f(not)g(onl\
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o(t.)171 2479 y(No)o(w)g(supp)q(ose)e(that)j(one)f(of)g(the)g(recipien)o(ts,)
f fh(r)1076 2486 y f3(1)1098 2479 y fk(,)h(in)g(addition)f(to)h(receiving)g
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193 254 y f3(2)214 247 y fk(.)33 b(The)20 b(question)g(is:)29 b(can)19 b fh
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1496 y(messages,)13 b(but)g(the)i(sender's)d fm(TMA)i fk(gets)g(burdened)e
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o(kground)12 b(information)h(b)q(eing)i(a)o(v)m(ailable)e(to)i(an)g(adv)o(ers\
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y fm(TMA)i fk(has)g(a)g(lot)h(less)f(w)o(ork)g(to)h(do)f(and)g(the)h fm(MTS)f
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(sp)q(eci\014cally)g(prohibits)f(this.)g eop bop 69 -50 a fn(Rep)o(rinted)12 b
(from)g fr(Pr)n(o)n(c)n(e)n(e)n(dings,)j(Se)n(c)n(ond)f(International)g(Symp)
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65 y(Finally)l(,)22 b(there)f(is)h(another)f(imp)q(ortan)o(t)g(tec)o(hnical)g
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(teraction)f(is)h(used)g(to)53 307 y(ensure)f(consistency)h(b)q(et)o(w)o(een)
h(the)f(states)h(of)g(the)g fm(KDS)f fk(and)g(the)h fm(TMA)p fk(.)f(The)g fp
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(age)53 608 y(In)o(tro)q(duction)6 b(.)19 b(.)i(.)g(.)g(.)g(.)g(.)g(.)f(.)h
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(.)g(.)f(.)h(.)g(.)g(.)g(.)g(.)g(.)f(.)h(.)93 b(15)171 1092 y(Op)q(en)16 b
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(.)f(.)h(.)g(.)g(.)g(.)g(.)g(.)f(.)h(.)93 b(23)53 1516 y(App)q(endix)16 b(C:)
g(Di\013erences)g(b)q(et)o(w)o(een)h(the)f(ANSI)h(and)f(TTI)h(drafts)32 b(.)
20 b(.)h(.)g(.)g(.)g(.)g(.)g(.)f(.)h(.)93 b(26)53 2584 y 600 2 v 49 2630 a f4
(This)13 b(do)q(cumen)o(t)h(\(v)o(ersion)g(#2.60\))e(w)o(as)i(T)733 2639 y
(E)756 2630 y(Xset)h(April)e(12,)g(1990)g(with)h(DISS.STY)f(v103.)1833 2819 y
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