82 lines
1.7 KiB
Plaintext
82 lines
1.7 KiB
Plaintext
usertype Sessionkey;
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usertype Keypart;
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secret k: Function;
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const f: Function;
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/*
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* Gong nonce based alternative
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*
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* Boyd & Mathuria: Protocols for authentication and key establishment
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* (2003) p. 101
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*/
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protocol gongnonceb(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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const ki: Keypart;
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var kr: Keypart;
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send_1 (I,S, I,R, { I,S,I, ki, R }k(I,S), ni );
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read_4 (S,I, { S,I,R,kr,I }k(I,S), { R,I,ni }f(ki,kr), nr );
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send_5 (I,R, { I,R,nr }f(ki,kr) );
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claim_6 (I, Secret, ki);
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claim_7 (I, Secret, kr);
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claim_8 (I, Nisynch);
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claim_9 (I, Niagree);
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}
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role R
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{
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var ni: Nonce;
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const nr: Nonce;
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const kr: Keypart;
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var ki: Keypart;
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read_2 (S,R, I,R, { S,R,I, ki, R }k(R,S), ni );
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send_3 (R,S, { R,S,R,kr,I }k(R,S), { R,I, ni }f(ki,kr), nr );
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read_5 (I,R, { I,R,nr }f(ki,kr) );
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claim_10 (R, Secret, ki);
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claim_11 (R, Secret, kr);
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claim_12 (R, Nisynch);
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claim_13 (R, Niagree);
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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 ki,kr: Keypart;
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var T;
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read_1 (I,S, I,R, { I,S,I, ki, R }k(I,S), ni );
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send_2 (S,R, I,R, { S,R,I, ki, R }k(R,S), ni );
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read_3 (R,S, { R,S,R,kr,I }k(R,S), T, nr );
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send_4 (S,I, { S,I,R,kr,I }k(I,S), T, nr );
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}
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}
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const Alice,Bob,Simon,Eve: Agent;
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untrusted Eve;
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const ne: Nonce;
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const kpe: Keypart;
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const ke: Sessionkey;
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compromised k(Eve,Eve);
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compromised k(Eve,Alice);
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compromised k(Eve,Bob);
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compromised k(Eve,Simon);
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compromised k(Alice,Eve);
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compromised k(Bob,Eve);
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compromised k(Simon,Eve);
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run gongnonceb.I(Agent,Agent,Simon);
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run gongnonceb.R(Agent,Agent,Simon);
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run gongnonceb.S(Agent,Agent,Simon);
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run gongnonceb.I(Agent,Agent,Simon);
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run gongnonceb.R(Agent,Agent,Simon);
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run gongnonceb.S(Agent,Agent,Simon);
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