/* 
 * Secrecy protocol
 *
 * Uses symmetric encryption
 */

// The protocol description

protocol protocol0symm(I,R)
{
	role I
	{
		fresh ni: Nonce;

		send_1(I,R, {I,ni}k(I,R) );
		claim_i(I,Secret,ni);
	}

	role R
	{
		var ni: Nonce;

		recv_1(I,R, {I,ni}k(I,R) );
		claim_r(R,Secret,ni);
	}
}