public Plaintext Decrypt(PrivateKey d, Ciphertext c)
{
if (!(c is ElGamalCiphertext))
throw new ArgumentException("Ciphertext must be ElGamalCiphertext!");
var ciphertext = c as ElGamalCiphertext;
var M = ciphertext.C2 - (ciphertext.C1 * d.Value);
return _encoder.DecodeMessage(M);
}
public void TestCiphertextCyclic()
{
var str = c.ToString();
var c2 = new Ciphertext(str);
Assert.AreEqual(c, c2);
}
public void Setup()
{
c = new Ciphertext(new byte[] { 72, 69, 73, 76 });
}