Security Flaw Allows Wiretaps to Be Evaded

"The New York Times is reporting( http://www.nytimes.com/2005/11/30/national/30tap.html ) that a team of researchers led by Matt Blaze has discovered that technology used for decades by law enforcement agents to wiretap telephones has a security flaw that allows the person being wiretapped to stop the recorder remotely. It is also possible to falsify the numbers dialed. The flaws are detailed in a paper being published by the IEEE. Someone who thinks he's being wiretapped can apparently just send a low tone down the line that turns off the recorder. The link has a demo."

Signaling Vulnerabilities in Wiretapping Systems (w/Audio example)
http://www.crypto.com/papers/wiretapping/


Full paper http://www.crypto.com/papers/wiretap.pdf