53 lines
955 B
Plaintext
53 lines
955 B
Plaintext
# 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/yahalom.html
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#
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#
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usertype SessionKey;
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protocol yahalom(I,R,S)
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{
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role I
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{
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fresh Ni: Nonce;
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var Nr: Nonce;
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var T: Ticket;
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var Kir: SessionKey;
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send_1(I,R, I,Ni);
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read_3(S,I, {R,Kir,Ni,Nr}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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}
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role R
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{
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fresh Nr: Nonce;
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var Ni: Nonce;
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var T: Ticket;
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var Kir: SessionKey;
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read_1(I,R, I,Ni);
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send_2(R,S, R, {I,Ni,Nr}k(R,S) );
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read_4(I,R, {I,Kir}k(R,S) , {Nr}Kir );
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claim_R1(R, Secret,Kir);
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}
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role S
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{
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fresh Kir: SessionKey;
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var Ni,Nr: Nonce;
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read_2(R,S, R, {I,Ni,Nr}k(R,S) );
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send_3(S,I, {R,Kir,Ni,Nr}k(I,S), {I,Kir}k(R,S) );
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claim(S, Secret, Ni);
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claim(S, Secret, Nr);
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}
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}
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