Research has found that Bluetooth devices -- including phones, PDAs, and personal computers -- can be hacked even when Bluetooth's security is enabled. Yaniv Shaked and Avishai Wool of Tel Aviv University have been able to compromise Bluetooth devices in as little as 0.06 seconds -- nearly real time -- by first forcing two to "pair," the term used when two Bluetooth gizmos first communicate, and establish a security key for future wireless transmission, then cracking the four-digit PIN that's default in most devices.
Read the article about this new threat at
Information Week
Read the researchers' Cracking The Bluetooth PIN paper
here
A summary of their research can be found
here