scyther/gui/Protocols/ISO-9798/isoiec-9798-2-1-udkey.spdl
2012-11-15 12:10:06 +01:00

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/*
* Modeled from ISO/IEC 9798
* Modeler: Cas Cremers, Dec. 2010
*
* symmetric
* one-pass
* unilateral
*
* Note: the identity B may be ommitted, if
* (a) the environment disallows such attacks, or
* (b) a unidirectional key is used
*/
protocol isoiec-9798-2-1-udkey(A,B)
{
role A
{
fresh TNA: Nonce;
fresh Text1,Text2: Ticket;
claim(A,Running,B,TNA,Text1);
send_1(A,B, Text2, { TNA, Text1 }k(A,B) );
}
role B
{
var TNA: Nonce;
var Text1,Text2: Ticket;
recv_1(A,B, Text2, { TNA, Text1 }k(A,B) );
claim(B,Commit,A,TNA,Text1);
claim(B,Alive);
claim(B,Weakagree);
}
}