Wikipedia
Pretty Good Privacy (PGP) is an 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 Phil Zimmermann developed PGP in 1991PGP and similar software follow the OpenPGP, an open standard of PGP encryption software, standard (RFC 4880) for encrypting and decrypting data
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