2006-11-21 13:42:06 +00:00
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# CCITT X.509 (1c)
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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_1c.html
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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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2012-04-23 14:53:28 +01:00
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hashfunction hash;
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2006-11-21 13:42:06 +00:00
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usertype Timestamp;
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protocol ccitt509-1c(I,R)
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{
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role I
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{
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const Ta: Timestamp;
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const Na,Xa,Ya: Nonce;
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send_1(I,R, I,{Ta, Na, R, Xa,{Ya,{hash(Ya)}sk(I)}pk(R)}sk(I));
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# claim_2(I,Nisynch);
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# This claim is useless as there are no preceding read events
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}
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role R
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{
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var Ta: Timestamp;
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var Na,Xa,Ya: Nonce;
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read_1(I,R, I,{Ta, Na, R, Xa,{Ya,{hash(Ya)}sk(I)}pk(R)}sk(I));
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claim_3(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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