40 lines
972 B
Plaintext
40 lines
972 B
Plaintext
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# BAN modified version of CCITT X.509 (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/ccittx509_3BAN.html
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#
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# Note:
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# The protocol description also states that Xa and Ya should be fresh
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# this can not be verified using scyther
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#
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# Note:
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# According to SPORE there are no known attacks on this protocol
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#
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protocol ccitt509-ban3(I,R)
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{
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role I
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{
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fresh Na,Xa,Ya: Nonce;
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var Xb,Nb,Yb: Nonce;
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send_1(I,R, I,{Na, R, Xa,{Ya}pk(R)}sk(I));
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read_2(R,I, R,{Nb, I, Na, Xb,{Yb}pk(I)}sk(R));
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send_3(I,R, I,{R, Nb}sk(I));
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claim_4(I,Nisynch);
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}
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role R
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{
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var Na,Xa,Ya: Nonce;
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fresh Xb,Yb,Nb: Nonce;
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read_1(I,R, I,{Na, R, Xa,{Ya}pk(R)}sk(I));
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send_2(R,I, R,{Nb, I, Na, Xb,{Yb}pk(I)}sk(R));
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read_3(I,R, I,{R, Nb}sk(I));
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claim_5(R,Nisynch);
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# There should also be Fresh Xa and Fresh Ya claims here
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}
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}
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