Beyond encryption: Stronger security for wireless communications

Physically, wireless communication channels are right out in the open, carried through the air on radio waves. A "wiretapper" can eavesdrop on mobile phone and data traffic without actually tapping a wire or optical fiber. An active wiretapper may also control or disturb a legitimate user's channel, or exploit side information to compromise the security of a message. Thus the last line of defense today is encryption, aimed at making the intercepted message difficult if not impossible for anyone other than the intended recipient to decipher. But cryptographic techniques are being rendered less and less secure by advances in computing.

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