scyther/testing/ibe.spdl

// 12/05/06
// S. Mauw
// Modeling of Identity Based Encryption primitive.

const pk: Function;
secret sk: Function;
const ibepublic: Function;
secret ibesecret: Function;
const param: Function;
inversekeys (pk,sk);
inversekeys (ibepublic,ibesecret);

protocol ibe(I,R,S)
{
	role I
	{
		fresh ni: Nonce;

	        recv_1(S,I, param(S) );
		send_3(I,R, {ni}ibepublic(param(S),R) );

		claim_i1(I,Secret,ni);
	}	
	
	role R
	{
		var ni: Nonce;

	        recv_2(S,R, {ibesecret(param(S),R)}pk(R) );
		recv_3(I,R, {ni}ibepublic(param(S),R) );

		claim_r1(R,Secret,ni);
		//of course this claim is invalid
	}

	role S
	{
	        send_1(S,I, param(S) );
	        send_2(S,R, {ibesecret(param(S),R)}pk(R) );
	}
}


compromised ibesecret(param(Eve),Alice);
compromised ibesecret(param(Eve),Bob);
compromised ibesecret(param(Eve),Carol);