Cracking the Bluetooth PIN
Tim Finin, 8:06am 4 June 2005Bruce Shneier report that Tel Aviv University researchers have demonstrated a passive attack that can recover the PIN used by bluetooth devices during the pairing protocol, allowing the attacker to eavesdrop on a Bluetooth network. The approach works for the four digit PINs adopted by industry. See their Mobisys 2005 paper or this news article.

