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Which of the following is the MOST reliable sender authentication method?

Digital signatures

Asymmetric cryptography

Digital certificates

Message authentication code

Digital certificates are issued by a trusted third party. The message sender attaches the certificate
and the recipient can verify authenticity with the certificate repository. Asymmetric cryptography,
such as public key infrastructure (PKl), appearsto authenticate the sender but is vulnerable to a
man-in-the-middle attack. Digital signatures are used for both authentication and confidentiality,
but the identity of the sender would still be confirmed by the digital certificate. Message
authentication code is used for message integrity verification.

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