PGP - Pretty Good Privacy

If you are not from the USA, see this European PGP mirror and look for files pgp263*i* (not ui and not without i). The latest international version is PGP 2.6.3i.

Some references:

The International PGP Home Page
PGP home page
EFH Pretty Good Privacy Workshop
Frequently Asked Questions (in HTML), or in plain text form
PGP 2.6.3i readme file
Francis Litterio's Crypto Page
Cryptography, privacy, security, etc.
Pointers to Cryptographic Software
How to Choose a Passphrase

Steganography Info and Archive
Golden Key Campaign for Private Communications Online
Blue Ribbon Campaign for Online Freedom of Speech

Services:

For publishing your public key and finding other people's public keys, use PGP Public Key Servers.

PGP public key servers
at e5.ijs.si
at www.pgp.com

PGP Digital Timestamping Service