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

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/*
* Modeled from ISO/IEC 9798
* Modeler: Cas Cremers, Dec. 2010
*
* symmetric
* two-pass
* unilateral
*
* Note: the identity A may be ommitted, if
* (a) the environment disallows such attacks, or
* (b) a unidirectional key is used
*/
protocol @keysymm-22(A,B)
{
role A
{
var T: Nonce;
var Text: Ticket;
recv_!1(B,A, { T, A, Text }k(A,B) );
send_!2(A,B, { T, A, Text }k(B,A) );
}
role B
{
var T: Nonce;
var Text: Ticket;
recv_!3(A,B, { T, B, Text }k(A,B) );
send_!4(B,A, { T, B, Text }k(B,A) );
}
}
protocol isoiec-9798-2-2(A,B)
{
role A
{
var RB: Nonce;
var Text1: Ticket;
fresh Text2,Text3: Ticket;
recv_1(B,A, RB,Text1 );
claim(A,Running,B,RB,Text2);
send_2(A,B, Text3, { RB, B, Text2 }k(B,A) );
}
role B
{
fresh RB: Nonce;
fresh Text1: Ticket;
var Text2,Text3: Ticket;
send_1(B,A, RB,Text1 );
recv_2(A,B, Text3, { RB, B, Text2 }k(B,A) );
claim(B,Commit,A,RB,Text2);
claim(B,Alive);
claim(B,Weakagree);
}
}