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…

Bcrypt is a password hashing function designed for secure password storage, not for encrypting messages or providing non-repudiation in communications.

Blowfish is a symmetric-key encryption algorithm used for data confidentiality, but it does not inherently provide non-repudiation without additional mechanisms like digital signatures.

PGP integrates symmetric encryption for message privacy and asymmetric encryption for digital signatures, which effectively provides non-repudiation by allowing the sender to prove authorship and message integrity. This combination directly fulfills the requirements for encrypted communication and sender accountability.

SHA (Secure Hash Algorithm) is a family of cryptographic hash functions used for data integrity and as part of digital signatures, but it does not encrypt messages for confidentiality.