The message M is converted to message digest using the hash function H(). The sender A sends the encrypted message digest to the receiver B and the receiver decrypts the message to authenticate the...

The message M is converted to message digest using the hash function H(). The sender A sends the encrypted message digest to the receiver B and the receiver decrypts the message to authenticate the sender. The private key is called Pr and the public key is called Py respectively. The message received by the receiver is?