When a user needs to provide message authenticity

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When a user needs to provide message authenticity, in the absence of a secure channel, what options may be the best?

A) Send a digital signature of the message to the recipient

B) Encrypt the message with a symmetric algorithm and send it

C) Create a checksum, append it to the message, encrypt the message, then send it to the recipient

D) Encrypt the message with a private key so the recipient can decrypt with the corresponding public key

Reference no: EM132265412

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