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.
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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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