PGP is a cross-platform authentication protocol that uses key encryption to verify the identity of clients and to securely exchange information after a client logs on to a system.

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PGP (Pretty Good Privacy) is an encryption program that provides cryptographic privacy and authentication for data communication. It is not specifically an authentication protocol for verifying identity upon login but rather used for encrypting/decrypting texts, emails, files, directories, and disk partitions to increase the security of email communications.

PGP Is a Cross-Platform Authentication Protocol That Uses Key Encryption