CompTIA Security+ (SY0-501) — Question 228

A system administrator wants to implement an internal communication system that will allow employees to send encrypted messages to each other. The system must also support non- repudiation. Which of the following implements all these requirements?

Answer options

• A. Bcrypt
• B. Blowfish
• C. PGP
• D. SHA

Correct answer: C

Explanation

PGP (Pretty Good Privacy) is designed for secure communication and provides encryption and non-repudiation through the use of digital signatures. Bcrypt and Blowfish are encryption algorithms but do not provide non-repudiation, while SHA is a hashing algorithm, which does not support encryption or non-repudiation.