CompTIA Security+ (SY0-601) — Question 484

Which of the following algorithms has the SMALLEST key size?

Answer options

• A. DES
• B. Twofish
• C. RSA
• D. AES

Correct answer: A

Explanation

DES (Data Encryption Standard) uses a 56-bit key size, which is smaller than the key sizes used by Twofish (128, 192, or 256 bits), RSA (commonly 1024 bits or more), and AES (128, 192, or 256 bits). Therefore, DES has the smallest key size among the options provided.