scyther/testing/andrew-ban.spdl

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usertype SessionKey;
secret k: Function;
protocol andrewBan(I,R)
{
role I
{
fresh ni: Nonce;
var nr,nr2: Nonce;
var kir: SessionKey;
send_1(I,R, I,{ni}k(I,R) );
recv_2(R,I, {ni,nr}k(I,R) );
send_3(I,R, {nr}k(I,R) );
recv_4(R,I, {kir,nr2,ni}k(I,R) );
claim_5(I,Nisynch);
claim_5b(I,Niagree);
claim_6(I,Secret, kir);
claim_7(I,Secret, k(I,R));
}
role R
{
var ni: Nonce;
fresh nr,nr2: Nonce;
fresh kir: SessionKey;
recv_1(I,R, I,{ni}k(I,R) );
send_2(R,I, {ni,nr}k(I,R) );
recv_3(I,R, {nr}k(I,R) );
send_4(R,I, {kir,nr2,ni}k(I,R) );
claim_8(R,Nisynch);
claim_8b(R,Niagree);
claim_9(R,Secret, kir);
claim_10(R,Secret, k(I,R));
}
}
const kee: SessionKey;