3 ms·

Or just a cryptographic challenge/response. No range limitations like time-of-flight, protects against replay, cheap with appropriate hardware. And since key fo

Or just a cryptographic challenge/response. No range limitations like time-of-flight, protects against replay, cheap with appropriate hardware. And since key fobs are custom hardware anyway (and typically expensive!) the <1$ crypto ICs I've used like the Microchip ATECC608 could be added to implement it with minimal price increase.

purple_ducks 7y ago
> Or just a cryptographic challenge/response This was a relay attack. Not a re_p_lay attack. It's just amplifying the signal from the outside car to the inside keys & vice versa.