scyther/testing/bke-variation.spdl

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/*
Bilateral Key Exchange with Public Key protocol (BKEPK)
Variation for exercise 2r890
*/
usertype Key;
const pk,hash: Function;
secret sk,unhash: Function;
inversekeys (pk,sk);
inversekeys (hash,unhash);
protocol bkevariation(I,R)
{
role I
{
fresh ni: Nonce;
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var nr: Nonce;
var kir: Key;
send_1 (I,R, { ni,I }pk(R) );
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recv_2 (R,I, { hash(ni),nr,kir }pk(I) );
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send_3 (I,R, { hash(nr) }kir );
claim_4 (I, Secret, kir );
claim_5 (I, Niagree );
claim_6 (I, Nisynch );
}
role R
{
var ni: Nonce;
fresh nr: Nonce;
fresh kir: Key;
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recv_1 (I,R, { ni,I }pk(R) );
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send_2 (R,I, { hash(ni),nr,kir }pk(I) );
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recv_3 (I,R, { hash(nr) }kir );
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claim_7 (R, Secret, kir );
claim_8 (R, Niagree );
claim_9 (R, Nisynch );
}
}
untrusted e;
compromised sk(e);