What is OpenPGP Keys?
OpenPGP is a tool for secure online communication. CPanel uses GnuPG for its public-key cryptography so that users may communicate securely.
Each person gets a pair of keys, called the public key and the private key. Each person's public key is published while the private key is kept secret. Messages are encrypted using the intended recipient's public key and can only be decrypted using their private key.