"Pretty Good Privacy" is a program for encrypting data that is based on the public-private key principle. Messages can be encrypted with a public key, but later they can only be decrypted and read with the private key.
Application program for encrypting electronic mail IDEA, RSA, MD5 Email signing and encryption, File encryption, Confidentiality, authentication, integrity, nonrepudiation
Public-key encryption software sold by Network Associates. PGP began as an open standard for message encryption. Add-ons are available for a number of desktop products. The underlying protocol has been designated a military weapon by the United States and some other countries in an effort to regulate its distribution, but similar software is widely available on the Internet.