What is Pretty Good Privacy (PGP) Key?

Pretty Good Privacy (PGP) is a commonly used encryption method for online communications. Using PGP, a message is converted to unreadable and encrypted text (ciphertext). Only the message recipient has the PGP key, which can convert the message back into readable text (plaintext). Thought to be very secure and private, PGP uses a combination of symmetric and public-key cryptography (PKC).