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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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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. Stamper - A free digital timestamping service which uses PGP and operates via email. Open PGP Alliance - A group of companies and other organizations that are implementers of the OpenPGP standard. Documentation, resources. 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. International PGP Home Page - Information on the PGP program, the OpenPGP standard and the PGPi project. Detailed documentation, lists of products and services. PGP Web of Trust Statistics - Statistics about the position of all keys within the Web of Trust. PGP pathfinder and key statistics - Statistics of PGP keys. The pathfinder finds trust paths between keys in the PGP web of trust. 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. 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. 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. Encrypt.to - 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. 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.

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