Law-enforcement authorities are troubled by a new kind of software being released Wednesday that sounds like something out of Mission: Impossible. It can make e-mail messages self-destruct in 10 seconds.. . .
Law-enforcement authorities are troubled by a new kind of software being released Wednesday that sounds like something out of Mission: Impossible. It can make e-mail messages self-destruct in 10 seconds.

Someone with the software, called SafeMessage, can transmit correspondence that, once opened, will vanish off the receiver's hard drive without a trace after a period of time set by the sender.

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