CompTIA Security+ (SY0-701) — Question 481

Which of the following cryptographic solutions protects data at rest?

Answer options

• A. Digital signatures
• B. Full disk encryption
• C. Private key
• D. Steganography

Correct answer: B

Explanation

Full disk encryption is specifically designed to protect data stored on a disk, ensuring that it remains secure even when the system is powered off. Digital signatures are used for authentication, private keys are part of encryption but do not encrypt data at rest, and steganography is about hiding data rather than encrypting it.