CISSP Practice Question: Which security concept is BEST supported by the use of digital signatures…
Published August 30, 2026 · Free daily CISSP practice question
Which security concept is BEST supported by the use of digital signatures to ensure a sender cannot deny having sent a specific message?
Correct Answer: A. Non-repudiation
Explanation (CISSP Manager Logic):
Non-repudiation combines authenticity and integrity to provide legal-strength proof of origin. It ensures that a party in a communication cannot falsely deny the validity of a signature or the transmission of a message.
By implementing non-repudiation, you:
- Provide evidence of data integrity
- Ensure the authenticity of the sender
- Establish legal accountability for transactions
While the other options are relevant, they fall short because:
- B: Availability focuses on the readiness and accessibility of systems and data.
- C: Authentication verifies identity but does not inherently prevent a user from later denying their actions.
- D: Confidentiality ensures data is not disclosed to unauthorized parties, which is not the goal of a signature.
Think like a manager:
Focus on the legal and accountability aspects of security. Non-repudiation is the specific mechanism used to bind an individual to their digital actions.
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