scyther/spdl/wmf-brutus.spdl

usertype SesKey, Server;
secret const k : Function;

/* Version from the Brutus reports
*/

protocol wmfbrutus(A,B,S)
{
	role A
	{
		const kab : SesKey;

		send_1(A,S, A, { B,kab }k(A,S) );
	}

	role B
	{
		var kab : SesKey;

		read_2(S,B, { A, kab }k(B,S) );

		claim(B, Secret,kab);
	}

	role S
	{
		var kab : SesKey;

		read_1(A,S, A, { B,kab }k(A,S) );
		send_2(S,B, { A, kab }k(B,S) );
	}
}

const Alice, Bob, Eve: Agent;
const Simon: Server;

untrusted Eve;
compromised k(Eve,Simon);

run wmfbrutus.A(Agent, Agent, Simon);
run wmfbrutus.B(Agent, Agent, Simon);
run wmfbrutus.A(Agent, Agent, Simon);
run wmfbrutus.B(Agent, Agent, Simon);
run wmfbrutus.A(Agent, Agent, Simon);
run wmfbrutus.B(Agent, Agent, Simon);

run wmfbrutus.S(Agent, Agent, Simon);