scyther/protocols/SPORE/yahalom-paulson.spdl
2007-05-17 17:28:10 +02:00

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# Paulson's strengthened version of Yahalom
#
# Modelled after the description in the SPORE library
# http://www.lsv.ens-cachan.fr/spore/yahalomPaulson.html
#
#
secret k : Function;
const Fresh: Function;
const Compromised: Function;
usertype SessionKey;
//protocol yahalom-Paulson^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: Nonce;
// const Kir: SessionKey;
// var I,R,S: Agent;
//
// read_!C1(C,C, I,R,S);
// send_!C2(C,C, I,Ni,
// R,Nr,{I,Ni}k(R,S),
// Nr,{R,Kir,Ni}k(I,S),
// {I,R,Kir,Nr}k(R,S),
// {Nr}Kir,
// Kir
// );
// claim_C3(C,Empty, (Compromised,Kir));
// }
//}
protocol yahalom-Paulson(I,R,S)
{
role I
{
const Ni: Nonce;
var Nr: Nonce;
var T: Ticket;
var Kir: SessionKey;
send_1(I,R, I,Ni);
read_3(S,I, Nr, {R,Kir,Ni}k(I,S), T );
send_4(I,R, T, {Nr}Kir );
claim_I1(I, Secret,Kir);
claim_I2(I, Nisynch);
claim_I3(I, Empty, (Fresh,Kir));
}
role R
{
const Nr: Nonce;
var Ni: Nonce;
var T: Ticket;
var Kir: SessionKey;
read_1(I,R, I,Ni);
send_2(R,S, R, Nr, {I,Ni}k(R,S) );
read_4(I,R, {I,R, Kir, Nr}k(R,S) , {Nr}Kir );
claim_R1(R, Secret,Kir);
claim_R2(R, Nisynch);
claim_R3(R, Empty, (Fresh,Kir));
}
role S
{
const Kir: SessionKey;
var Ni,Nr: Nonce;
read_2(R,S, R, Nr, {I,Ni}k(R,S) );
send_3(S,I, Nr, {R,Kir,Ni}k(I,S), {I,R,Kir,Nr}k(R,S) );
}
}
const Alice,Bob,Simon : Agent;