CNET News.com: "Don't be too sure your car is an island of privacy. Under certain circumstances, outsiders can eavesdrop on conversations among you and your passengers if your car has a built-in Bluetooth telephone link.
Bluetooth provides a low-power wireless connection between your cell phone and your car--it permits hands-free conversations through a speaker and microphone built into the vehicle, or with a headset--and it may be vulnerable to amateur eavesdroppers. At a recent computer security convention in the Netherlands, a group of European wireless-security experts called the Trifinite Group demonstrated a system that lets a laptop user listen to conversations in passing cars with Bluetooth setups. "
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