72 lines
1.4 KiB
Plaintext
72 lines
1.4 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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#
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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 const k : Function;
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usertype String,SessionKey,Ticket;
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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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const Ni : Nonce;
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const 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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}
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role R
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{
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var M : String;
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const 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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}
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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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const 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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const Alice, Bob, Eve, Simon: Agent;
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untrusted Eve;
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compromised k(Eve,Simon);
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run otwayrees.A(Alice, Agent, Simon);
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run otwayrees.B(Agent, Bob, Simon);
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run otwayrees.S(Agent, Agent, Simon);
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run otwayrees.A(Agent, Agent, Simon);
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run otwayrees.B(Agent, Agent, Simon);
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run otwayrees.S(Agent, Agent, Simon);
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