PGP Encryption (Pretty Good Privacy) is a computer program which provides cryptographic privacy and authentication. The first PGP version, by designer and developer Phil Zimmermann, became available in 1991. Since then major enhancements have been made and a wide range of products are now available from PGP Corporation and other companies.

While originally used primarily for encrypting the contents of email messages and attachments from a desktop client, PGP products have been diversified since 2002 into a set of encryption applications which can be managed by an optional central policy server. PGP encryption applications include email and attachments, digital signatures, laptop full disk encryption, file and folder security, protection for IM sessions, batch file transfer encryption, and protection for files and folders stored on network servers.

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