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Can you list the top facts and stats about Pretty Good Privacy?
Summarize this article for a 10 years old
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 1991.
|Initial release||1991; 32 years ago (1991)|
|Operating system||Linux (and Android), macOS, Windows|
|License||Commercial proprietary software|
PGP and similar software follow the OpenPGP, an open standard of PGP encryption software, standard (RFC 4880) for encrypting and decrypting data. Modern versions of PGP are interoperable with GnuPG and other OpenPGP-compliant systems.