CompTIA Security+ (SY0-501) — Question 319

Which of the following scenarios BEST describes an implementation of non-repudiation?

Answer options

• A. A user logs into a domain workstation and access network file shares for another department
• B. A user remotely logs into the mail server with another user's credentials
• C. A user sends a digitally signed email to the entire finance department about an upcoming meeting
• D. A user access the workstation registry to make unauthorized changes to enable functionality within an application

Correct answer: C

Explanation

Non-repudiation ensures that a sender cannot deny having sent a message. Option C is correct because the user sends a digitally signed email, providing proof of origin. The other options do not provide evidence of action or accountability and involve unauthorized access or actions.