CompTIA Security+ (SY0-601) — Question 673

Which of the following is assured when a user signs an email using a private key?

Answer options

• A. Non-repudiation
• B. Confidentiality
• C. Availability
• D. Authentication

Correct answer: A

Explanation

The correct answer is A, Non-repudiation, because signing an email with a private key ensures that the sender cannot deny having sent the message. Options B (Confidentiality), C (Availability), and D (Authentication) are not directly assured by the act of signing; they pertain to different aspects of security.