57 lines
1.2 KiB
Plaintext
57 lines
1.2 KiB
Plaintext
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# Otway Rees
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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/otwayRees.html
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#
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const Fresh: Function;
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const Compromised: Function;
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usertype String,SessionKey;
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protocol otwayrees(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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fresh M : String;
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var Kir : SessionKey;
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send_1(I,R, M,I,R,{Ni,M,I,R}k(I,S) );
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read_4(R,I, M,{Ni,Kir}k(I,S) );
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claim_I1(I, Secret,Kir);
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claim_I2(I, Nisynch);
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claim_I3(I, Empty, (Fresh,Kir));
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}
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role R
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{
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var M : String;
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fresh Nr : Nonce;
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var Kir : SessionKey;
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var T1,T2: Ticket;
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read_1(I,R, M,I,R, T1 );
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send_2(R,S, M,I,R, T1, { Nr,M,I,R }k(R,S) );
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read_3(S,R, M, T2, { Nr,Kir }k(R,S) );
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send_4(R,I, M, T2 );
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claim_R1(R, Secret,Kir);
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claim_R2(R, Nisynch);
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claim_R3(R, Empty, (Fresh,Kir));
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}
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role S
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{
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var Ni,Nr : Nonce;
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var M : String;
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fresh Kir : SessionKey;
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read_2(R,S, M,I,R, { Ni,M,I,R}k(I,S), { Nr,M,I,R }k(R,S) );
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send_3(S,R, M, { Ni,Kir }k(I,S) , { Nr,Kir }k(R,S) );
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}
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}
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