Two cryptologists announced Tuesday that they had found a flaw in the most widely used program for sending encrypted, or coded, e-mail messages. If confirmed, the flaw would allow a determined adversary to obtain secret codes used by senders of encrypted . . .
Two cryptologists announced Tuesday that they had found a flaw in the most widely used program for sending encrypted, or coded, e-mail messages. If confirmed, the flaw would allow a determined adversary to obtain secret codes used by senders of encrypted e-mail.

The program, called PGP for Pretty Good Privacy, is used by human rights organizations to protect vulnerable sources, by corporations to ensure secure communications and by millions of individual users. American security experts cautioned that they could not fully judge the accuracy of the claim, which was issued in Prague, before more technical details became available. The experts also noted that some sort of access to the sender's computer -- either directly or via the Internet -- would be needed to exploit any such flaw.

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