secret k: Nonce;
const Alice,Bob,Charlie: Agent;
const ne: Nonce;

protocol simplest(I)
{
	role I
	{
		var x: Nonce;
		const n: Nonce;

		read(I,I, x);
		send(I,I, n, {n, x}k );
	}
}

run simplest.I(Alice);
run simplest.I(Alice);