56 lines
944 B
Plaintext
56 lines
944 B
Plaintext
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/*
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* Boyd fix for NS(L)
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*
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* From the paper "Towards Extensional Goals in Authentication
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* Protocols"
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*
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* Broken. Best shown by attack id 4.
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*/
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const pk: Function;
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secret sk: Function;
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inversekeys (pk,sk);
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const hash: Function;
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secret unhash: Function;
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inversekeys (hash,unhash);
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protocol boydNS(I,R)
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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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send_1(I,R, {ni}pk(R),I );
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read_2(R,I, {nr}pk(I),hash(ni,R) );
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send_3(I,R, hash(nr, I,R) );
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claim_i1(I,Secret,ni);
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claim_i2(I,Secret,nr);
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claim_i3(I,Niagree);
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claim_i4(I,Nisynch);
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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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read_1(I,R, {ni}pk(R),I );
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send_2(R,I, {nr}pk(I),hash(ni,R) );
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read_3(I,R, hash(nr, I,R) );
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claim_r1(R,Secret,ni);
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claim_r2(R,Secret,nr);
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claim_r3(R,Niagree);
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claim_r4(R,Nisynch);
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}
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}
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const Alice,Bob,Eve: Agent;
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untrusted Eve;
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const ne: Nonce;
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compromised sk(Eve);
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run boydNS.I(Agent,Agent);
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run boydNS.R(Agent,Agent);
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