scyther/spdl/SPORE/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
#
#
secret k : Function;
usertype Key;
protocol yahalomLowe(I,R,S)
{
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role I
{
const Ni: Nonce;
var Nr: Nonce;
var Kir: Key;
send_1(I,R, I,Ni);
read_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
{
const Nr: Nonce;
var Ni: Nonce;
var Kir: Key;
read_1(I,R, I,Ni);
send_2(R,S, {I,Ni,Nr}k(R,S) );
read_4(S,R, {I,Kir}k(R,S));
read_5(I,R, {I, R, S, Nr}Kir);
claim_R1(R, Secret,Kir);
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claim_R2(R, Nisynch);
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}
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role S
{
const Kir: Key;
var Ni,Nr: Nonce;
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read_2(R,S, {I,Ni,Nr}k(R,S) );
send_3(S,I, {R,Kir,Ni,Nr}k(I,S));
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send_4(S,R, {I,Kir}k(R,S));
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}
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}
const Alice,Bob,Simon : Agent;
run yahalomLowe.I(Agent,Agent,s);
run yahalomLowe.I(Agent,Agent,s);
run yahalomLowe.R(Agent,Agent,s);