scyther/gui/Protocols/yahalom.spdl
2007-05-19 17:10:46 +02:00

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# Yahalom
#
# Modelled after the description in the SPORE library
# http://www.lsv.ens-cachan.fr/spore/yahalom.html
#
#
secret k : Function;
usertype SessionKey;
protocol yahalom(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, {R,Kir,Ni,Nr}k(I,S), T );
send_4(I,R, T, {Nr}Kir );
claim_I1(I, Secret,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, {I,Ni,Nr}k(R,S) );
read_4(I,R, {I,Kir}k(R,S) , {Nr}Kir );
claim_R1(R, Secret,Kir);
}
role S
{
const Kir: SessionKey;
var Ni,Nr: Nonce;
read_2(R,S, R, {I,Ni,Nr}k(R,S) );
send_3(S,I, {R,Kir,Ni,Nr}k(I,S), {I,Kir}k(R,S) );
claim(S, Secret, Ni);
claim(S, Secret, Nr);
}
}
const Alice,Bob,Simon : Agent;
const Eve: Agent;
untrusted Eve;
compromised k(Eve,Simon);