Voice encryption may draw U.S. scrutiny
Philip R. Zimmermann created a program to encrypt e-mail. His Zfone will do the same for Internet calls.
He has found out once already. Trained as a computer scientist, he developed a program in 1991 called Pretty Good Privacy, or PGP, for scrambling and unscrambling e-mail messages. It won a following among privacy rights advocates and human rights groups working overseas ó and a three-year federal criminal investigation into whether he had violated export restrictions on cryptographic software. The case was dropped in 1996, and Mr. Zimmermann, who lives in Menlo Park, Calif., started PGP Inc. to sell his software commercially.
At the New York Times.
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