64 lines
1.3 KiB
Plaintext
64 lines
1.3 KiB
Plaintext
# Paulson's strengthened version of Yahalom
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#
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# Modelled after the description in the SPORE library
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# http://www.lsv.ens-cachan.fr/spore/yahalomPaulson.html
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#
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# Note:
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# This protocol uses a ticket so scyther will only be able to verify
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# the protocol using the ARACHNE engine (-a) and type 2 matching (-m2)
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#
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secret k : Function;
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usertype Ticket, Key;
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protocol yahalomPaulson(I,R,S)
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{
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role I
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{
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const Ni: Nonce;
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var Nr: Nonce;
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var T: Ticket;
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var Kir: Key;
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send_1(I,R, I,Ni);
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read_3(S,I, Nr, {R,Kir,Ni}k(I,S), T );
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send_4(I,R, T, {Nr}Kir );
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claim_I1(I, Secret,Kir);
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claim_I2(I, Nisynch);
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}
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role R
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{
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const Nr: Nonce;
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var Ni: Nonce;
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var T: Ticket;
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var Kir: Key;
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read_1(I,R, I,Ni);
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send_2(R,S, R, Nr, {I,Ni}k(R,S) );
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read_4(I,R, {I,R, Kir, Nr}k(R,S) , {Nr}Kir );
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claim_R1(R, Secret,Kir);
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claim_R2(R, Nisynch);
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}
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role S
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{
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const Kir: Key;
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var Ni,Nr: Nonce;
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read_2(R,S, R, Nr, {I,Ni}k(R,S) );
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send_3(S,I, Nr, {R,Kir,Ni}k(I,S), {I,R,Kir,Nr}k(R,S) );
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}
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}
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const Alice,Bob,Simon : Agent;
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run yahalomPaulson.I(Agent,Agent,s);
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run yahalomPaulson.I(Agent,Agent,s);
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run yahalomPaulson.R(Agent,Agent,s);
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