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yahalom-lowe.spdl
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yahalom-lowe.spdl
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# Lowe's modified version of Yahalom
#
# Modelled after the description in the SPORE library
# http://www.lsv.ens-cachan.fr/spore/yahalomLowe.html
#
#
usertype SessionKey;
protocol yahalom-Lowe(I,R,S)
{
role I
{
fresh Ni: Nonce;
var Nr: Nonce;
var Kir: SessionKey;
send_1(I,R, I,Ni);
recv_3(S,I, {R,Kir,Ni,Nr}k(I,S) );
send_5(I,R, {I, R, S, Nr}Kir );
claim_I1(I, Secret,Kir);
claim_I2(I, Nisynch);
}
role R
{
fresh Nr: Nonce;
var Ni: Nonce;
var Kir: SessionKey;
recv_1(I,R, I,Ni);
send_2(R,S, {I,Ni,Nr}k(R,S) );
recv_4(S,R, {I,Kir}k(R,S));
recv_5(I,R, {I, R, S, Nr}Kir);
claim_R1(R, Secret,Kir);
claim_R2(R, Nisynch);
}
role S
{
fresh Kir: SessionKey;
var Ni,Nr: Nonce;
recv_2(R,S, {I,Ni,Nr}k(R,S) );
send_3(S,I, {R,Kir,Ni,Nr}k(I,S));
send_4(S,R, {I,Kir}k(R,S));
}
}