PGP (Pretty Good Privacy) is a public key encryption program that provides cryptographic privacy and authentication for data communication. PGP is used for signing, encrypting, and decrypting texts, e-mails, files, directories, and whole disk partitions and to increase the security of e-mail communications.
PGP uses a private key that must be kept secret and a public key that sender and receiver must share. The technology is also known as GPG (Gnu Privacy Guard or GnuPG), which is a fully compatible GPL-licensed alternative.
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