(self, ciphertext)
Decryption method
        :param ciphertext:
        :return:
Decryption method
        :param ciphertext:
        :return:
Decryption method : param ciphertext : : return :
def decrypt(self, ciphertext):
        """
        Decryption method
        :param ciphertext:
        :return:
        """
        pass
def decrypt ( self , ciphertext ) : pass