scyther/spdl/SPORE/neumannstub-hwang.spdl

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# Hwang modified Neumann Stubblebine
#
# Modelled after the description in the SPORE library
# http://www.lsv.ens-cachan.fr/spore/neumannStubblebineHwang.html
#
# Note:
# This protocol uses a ticket so scyther will only be able to verify
# the protocol using the ARACHNE engine (-a)
#
# Note:
# According to SPORE there are no attacks on this protocol, scyther
# finds one however. This has to be investigated further.
usertype Server, SessionKey, TimeStamp, TicketKey;
usertype ExpiredTimeStamp;
secret k: Function;
const a, b, e: Agent;
const s: Server;
const Fresh: Function;
const Compromised: Function;
const ne: Nonce;
const kee: SessionKey;
untrusted e;
compromised k(e,s);
protocol neustub-Hwang^KeyCompromise(C)
{
// Read the names of 3 agents and disclose a session between them including
// corresponding session key to simulate key compromise
role C {
const Ni,Nr,Mi,Mr: Nonce;
const Kir: SessionKey;
const Tr: ExpiredTimeStamp;
var I,R,S: Agent;
read_C1(C,C, I,R,S);
send_C2(C,C, I,Ni,
R,{I,Ni,Tr,Nr}k(R,S),
{R,Ni,Kir,Tr}k(I,S),
{I,Kir,Tr}k(R,S), Nr,
{Nr}Kir,
Mi,{I,Kir,Tr}k(R,S),
Mr,{Mr}Kir,
{Mr}Kir,
Kir
);
claim_C3(C,Empty, (Compromised,Kir));
}
}
protocol neustub-Hwang(I,R,S)
{
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role I
{
const Ni,Mi: Nonce;
var Nr,Mr: Nonce;
var T: Ticket;
var Tb: TimeStamp;
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var Kir: SessionKey;
send_1(I,R, I, Ni);
read_3(S,I, { R,Ni,Kir,Tb}k(I,S), T, Nr);
send_4(I,R,T,{Nr}Kir);
send_5(I,R,Mi,T);
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read_6(R,I,Mr,{Mr}Kir);
send_7(I,R,{Mr}Kir);
claim_I1(I,Secret, Kir);
claim_I2(I,Niagree);
claim_I3(I,Nisynch);
claim_I4(I,Empty,(Fresh,Kir));
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}
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role R
{
var Ni,Mi: Nonce;
const Nr,Mr: Nonce;
var Kir: SessionKey;
const Tb: TimeStamp;
var T: Ticket;
read_1(I,R, I, Ni);
send_2(R,S, R, {I, Ni, Tb, Nr}k(R,S));
read_4(I,R,{I,Kir,Tb}k(R,S),{Nr}Kir);
read_5(I,R,Mi,T);
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send_6(R,I,Mr,{Mr}Kir);
read_7(I,R,{Mr}Kir);
claim_R1(R,Secret, Kir);
claim_R2(R,Niagree);
claim_R3(R,Nisynch);
claim_R4(R,Empty,(Fresh,Kir));
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}
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role S
{
var Ni, Nr: Nonce;
const Kir: SessionKey;
var Tb: TimeStamp;
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read_2(R,S, R, {I,Ni,Tb,Nr}k(R,S));
send_3(S,I, { R, Ni, Kir, Tb}k(I,S), { I,Kir,Tb}k(R,S),Nr );
}
}
run neustub-Hwang.A(a,b,s);
run neustub-Hwang.B(a,b,s);
run neustub-Hwang.S(a,b,s);