54 lines
1.1 KiB
Plaintext
54 lines
1.1 KiB
Plaintext
# Denning-Sacco shared key
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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/denningSacco.html
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#
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usertype Key;
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usertype SessionKey;
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usertype TimeStamp;
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usertype ExpiredTimeStamp;
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const Fresh: Function;
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const Compromised: Function;
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protocol denningSacco(I,R,S)
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{
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role I
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{
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var W: Ticket;
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var Kir: SessionKey;
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var T: TimeStamp;
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send_1(I,S, I,R );
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recv_2(S,I, {R, Kir, T, W}k(I,S) );
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send_3(I,R, W);
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claim_I1(I,Niagree);
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claim_I2(I,Nisynch);
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claim_I3(I,Secret,Kir);
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claim_I4(I,Empty, (Fresh,Kir));
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}
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role R
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{
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var Kir: SessionKey;
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var T: TimeStamp;
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recv_3(I,R, {Kir,I,T}k(R,S));
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claim_R1(R,Niagree);
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claim_R2(R,Nisynch);
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claim_R3(R,Secret,Kir);
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claim_R4(R,Empty, (Fresh,Kir));
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}
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role S
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{
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var W: Ticket;
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fresh Kir: SessionKey;
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fresh T: TimeStamp;
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recv_1(I,S, I,R );
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send_2(S,I, {R, Kir, T, {Kir, I,T}k(R,S)}k(I,S));
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}
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}
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