Pretty Good Privacy 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.
OpenPGP
OpenPGP is a non-proprietary protocol for encrypting email communication
using public key cryptography. It is based on the original PGP (Pretty
Good Privacy) software. The OpenPGP protocol defines standard formats for
encrypted messages, signatures, and certificates for exchanging public
keys. Beginning in 1997, the OpenPGP Working Group was formed in the
Internet Engineering Task Force (IETF) to define this standard that had
formerly been a proprietary product since 1991. Over the past decade, PGP,
and later OpenPGP, has become the standard for nearly all of the world’s
encrypted email. As an IETF Proposed Standard RFC 4880, OpenPGP can be
implemented by any company without paying any licensing fees to anyone.
OpenPGP.js
This project aims to provide an Open Source OpenPGP library in JavaScript
so it can be used on virtually every device. Instead of other
implementations that are aimed at using native code, OpenPGP.js is meant
to bypass this requirement (i.e. people will not have to install gpg on
their machines in order to use the library). The idea is to implement all
the needed OpenPGP functionality in a JavaScript library that can be
reused in other projects that provide browser extensions or server
applications. It should allow you to sign, encrypt, decrypt, and verify
any kind of text - in particular e-mails - as well as managing keys.