62 lines
1.9 KiB
Plaintext
62 lines
1.9 KiB
Plaintext
// 12/05/06
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// S. Mauw
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// Using Identity Based Encryption primitive to make NSL authentication.
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// The only requirement on the server communications is that the
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// sending of the private key is secret.
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const ibepublic: Function; //publicly known key construction from server
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//parameters and recipient name
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secret ibesecret: Function;//secret key determined by server for recipient
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const param: Function; //public security parameter of server
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inversekeys (ibepublic,ibesecret);
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protocol ibe(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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var nr: Nonce;
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//Note that we are not interested in the order of server messages.
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recv_!1(S,I, param(S) );
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send_3(I,R, {I,ni}ibepublic(param(S),R) );
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recv_4(R,I, {ni,nr,R}ibepublic(param(S),I) );
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send_5(I,R, {nr}ibepublic(param(S),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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fresh nr: Nonce;
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recv_!2(S,R, {ibesecret(param(S),R)}pk(R) );
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recv_3(I,R, {I,ni}ibepublic(param(S),R) );
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send_4(R,I, {ni,nr,R}ibepublic(param(S),I) );
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recv_5(I,R, {nr}ibepublic(param(S),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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role S
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{
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recv_!0(S,S, R,S); // workaround for the fact that R & S are roles, so Scyther should not jump to conclusions (remove it and see what happens)
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send_!1(S,I, param(S) );
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send_!2(S,R, {ibesecret(param(S),R)}pk(R) );
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claim_s1(S,Secret,ibesecret(param(S),R));
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}
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}
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compromised ibesecret(param(Eve),Alice);
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compromised ibesecret(param(Eve),Bob);
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compromised ibesecret(param(Eve),Carol);
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