Which of the following provides the GREATEST assurance of
message authenticity?

A. The pre-hash code is derived mathematically from the
message being sent.

B. The pre-hash code is encrypted using the sender's private
key.

C. Encryption of the pre-hash code and the message using the
secret key.

D. Sender attains the recipient's public key and verifies
the authenticity of its digital certificate with a
certificate authority.

Answer Posted / guest

Answer: B

Encrypting the pre-hash code using the sender's private key
provides assurance of the authenticity of the message.
Mathematically deriving the pre-hash code provides integrity
to the message. Encrypting the pre-hash code and the message
using the secret key provides confidentiality.

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