washingtonpost.com: Pretty Good Update for E-Mail Privacy

Internet users send millions of e-mail messages every day, oblivious to their lack of confidentiality. For years, a powerful and free encryption program called PGP, or Pretty Good Privacy, allowed users to keep their e-mail and other data private. But Network Associates, which bought PGP in late 1997, failed to sell upgraded versions to businesses and let the program drift into limbo from mid-2001 on, without any significant updates.