Regarding the Bluetooth proximity unlock, there is a way to exploit such a 
system without the victim ever being without his fob.  It's a simple exploit.  
Car thieves have been using it for several years with RFID-based start and 
unlock fobs: use a pair of transceivers to extend the RFID range.  In 
networking terms, the paired transceivers form a bridge between car and fob.

A similar attack against a Bt proximity unlock could work the same way.  The 
transceivers need to be a little more sophisticated to handle the frequency 
hopping that Bt uses but that isn't difficult: just gang together enough 
transceivers to handle the full spectrum and run them in parallel.

--Rich P.

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