1. B decrypts the message with his private key and verifies the identity of A using A's public key.
  2. If the identity is verified, B decrypts the second message with his shared secret key and checks if the nonce NB matches the one sent in the first message.
  3. If the nonce matches, B accepts the message and sends a confirmation message to A. If not, B rejects the message and does not send a confirmation.
  4. A receives the confirmation and knows that the message was successfully received and accepted by B
1 B -A NB2 A-B NB BKAB

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