60 lines
1.3 KiB
Plaintext
60 lines
1.3 KiB
Plaintext
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# Kao Chow Authentication v.3
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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/kaoChow3.html
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#
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usertype SessionKey;
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usertype ExpiredTimeStamp;
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usertype TimeStamp;
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const Fresh: Function;
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const Compromised: Function;
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protocol kaochow-3(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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var kir,kt: SessionKey;
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var T2: Ticket;
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send_1 (I,S, I,R,ni);
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read_3 (R,I, {I,R,ni,kir,kt}k(I,S), {ni, kir}kt, nr, T2 );
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send_4 (I,R, {nr,kir}kt, T2 );
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claim_I1 (I, Nisynch);
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claim_I2 (I, Niagree);
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claim_I3 (I, Secret, kir);
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claim_I4 (I, Empty, (Fresh,kir));
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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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var kir,kt: SessionKey;
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var T: Ticket;
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fresh tr: TimeStamp;
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read_2 (S,R, T, { I,R,ni,kir,kt }k(R,S) );
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send_3 (R,I, T, {ni, kir}kt, nr, {I,R,tr,kir}k(R,S) );
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read_4 (I,R, {nr,kir}kt, {I,R,tr,kir}k(R,S) );
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claim_R1 (R, Nisynch);
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claim_R2 (R, Niagree);
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claim_R3 (R, Secret, kir);
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claim_R4 (R, Empty, (Fresh,kir));
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}
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role S
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{
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var ni: Nonce;
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fresh kir, kt: SessionKey;
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read_1 (I,S, I,R,ni);
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send_2 (S,R, {I,R,ni,kir,kt}k(I,S), { I,R,ni,kir,kt }k(R,S) );
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}
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}
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