Pretty Good Privacy (PGP) is a cryptographic software suite used for encrypting, decrypting, signing and verifying texts, e-mails, files, directories, and whole disk partitions. Its primary aim is to increase the security of e-mail communications. It was created by Phil Zimmermann in 1991.

PGP follows the OpenPGP standard (RFC 4880) for encrypting and decrypting data.

GNU Privacy Guard (GnuPG or GPG) is a free software replacement for the PGP cryptographic software suite. It is also compliant with RFC 4880.

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International PGP Home Page
Information on the PGP program, the OpenPGP standard and the PGPi project. Detailed documentation, lists of products and services.
15 reasons not to start using PGP
The collection of reasons to prefer more advanced cryptographic communications tools and stop investing in the old PGP over e-mail architecture, the problem mostly being e-mail rather than PGP.
Encrypts the message with PGP (client-side) and sends it on to the mail account. A user who does not use PGP can send fairly secure mails to PGP-users. The public key will be loaded from a public keyserver.
A Few Thoughts on Cryptographic Engineering: What's the matter with PGP?
Matthew Green's blog entry, discussing the problems with keys, key management, lack of forward secrecy, the OpenPGP format and mail client implementations.
Open PGP Alliance
A group of companies and other organizations that are implementers of the OpenPGP standard. Documentation, resources.
PGP pathfinder and key statistics
Statistics of PGP keys. The pathfinder finds trust paths between keys in the PGP web of trust.
PGP Web of Trust Statistics
Statistics about the position of all keys within the Web of Trust.
Phil Zimmermann's Home Page
Phil Zimmermann is the original creator of PGP and a founder of PGP, Inc. The site offers historical background and current resource links.
Phuctor: The RSA Super Collider
Online tool for testing PGP/GnuPG public keys for obvious flaws using Euclid's Greatest Common Divisor theorem as well as shared moduli.
A security analysis of PGP
Contains the result of a research project into PGP. It describes the Otterloo attack, aka PGPsdk Key Validity Vulnerability , an important attack on various windows versions of PGP. The full paper describes the history, algorithms (IDEA, RSA, DH/ ElGamal,DSA in full detail), bugs and source code of the program.
A free digital timestamping service which uses PGP and operates via email.
ProPublica: The World's Email Encryption Software Relies on One Guy, Who is Going Broke
Werner Koch's code powers the email encryption programs around the world. If only somebody would pay him for the work. Article by Julia Angwin. (February 05, 2015)

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