Re:Drivers locked out of their cars at Royston Tesco
by michaelt on Sunday February 28, 2021 @05:55AM
(#26292412)
You jam at a slightly different frequency - different enough that you can tell the signals apart with your hackrf, but close enough that the receiver chip can't [1]
Of course, the strategy I've heard outlined is to jam and record one rolling code, then a second one, then to replay the first code so the fob holder sees the system respond to their button press but the attacker has a ready-to-use code. If people are seeing their cars failing to unlock, it's not that specific attack.
Of course, the strategy I've heard outlined is to jam and record one rolling code, then a second one, then to replay the first code so the fob holder sees the system respond to their button press but the attacker has a ready-to-use code. If people are seeing their cars failing to unlock, it's not that specific attack.
[1] Page 63 of https://samy.pl/defcon2015/2015-defcon.pdf