51 lines
1.0 KiB
Plaintext
51 lines
1.0 KiB
Plaintext
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/*
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* Modeled from ISO/IEC 9798
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* Modeler: Cas Cremers, Dec. 2010
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*
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* symmetric
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* three-pass
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* mutual
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*
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* Note: the identity inside the encryption may be ommitted, if
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* (a) the environment disallows such attacks, or
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* (b) a unidirectional key is used
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*
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* In case (b), modeled here, the second key is reversed.
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*/
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protocol isoiec-9798-2-4-udkey(A,B)
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{
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role A
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{
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var RB: Nonce;
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fresh RA: Nonce;
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var Text1,Text4,Text5: Ticket;
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fresh Text2,Text3: Ticket;
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recv_1(B,A, RB,Text1 );
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claim(A,Running,B,RA,RB,Text2);
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send_2(A,B, Text3, { RA, RB, Text2 }k(A,B) );
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recv_3(B,A, Text5, { RB, RA, Text4 }k(B,A) );
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claim(A,Commit,B,RA,RB,Text2,Text4);
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claim(A,Alive);
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claim(A,Weakagree);
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}
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role B
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{
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fresh RB: Nonce;
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var RA: Nonce;
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fresh Text1,Text4,Text5: Ticket;
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var Text2,Text3: Ticket;
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send_1(B,A, RB,Text1 );
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recv_2(A,B, Text3, { RA, RB, Text2 }k(A,B) );
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claim(B,Running,A,RA,RB,Text2,Text4);
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send_3(B,A, Text5, { RB, RA, Text4 }k(B,A) );
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claim(B,Commit,A,RA,RB,Text2);
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claim(B,Alive);
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claim(B,Weakagree);
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}
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}
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