Wired News: Privacy Guru Locks Down VOIP

"First there was PGP e-mail. Then there was PGPfone for modems. Now Phil Zimmermann, creator of the wildly popular Pretty Good Privacy e-mail encryption program, is debuting his new project, which he hopes will do for internet phone calls what PGP did for e-mail.

Zimmermann has developed a prototype program for encrypting voice-over IP which he will announce tomorrow during a presentation at the BlackHat security conference in Las Vegas."