CompTIA Security+ (SY0-501) — Question 321

Which of the following encryption algorithms is used primarily to secure data at rest?

Answer options

• A. AES
• B. SSL
• C. TLS
• D. RSA

Correct answer: A

Explanation

AES (Advanced Encryption Standard) is specifically designed for securing data at rest, making it the preferred choice for encrypting files and databases. In contrast, SSL (Secure Sockets Layer) and TLS (Transport Layer Security) are protocols used for securing data in transit, while RSA (Rivest-Shamir-Adleman) is an asymmetric encryption algorithm primarily used for secure key exchange rather than for encrypting data at rest.