CompTIA Security+ (SY0-501) — Question 626

Which of the following encryption algorithms require one encryption key? (Choose two.)

Answer options

• A. MD5
• B. 3DES
• C. BCRYPT
• D. RC4
• E. DSA

Correct answer: B, D

Explanation

The correct answers, 3DES and RC4, are symmetric encryption algorithms that use a single key for both encryption and decryption. In contrast, MD5 is a hashing algorithm, BCRYPT is a password hashing function, and DSA is a digital signature algorithm, none of which operate using a single encryption key.