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This. There is seemingly no incentive for manufacturers to make it harder to steal their cars - every stolen car is likely a new sale.

Unlike the US, it was also illegal to listen in on police radio frequencies. I always felt this was madness to make it illegal rather than adopt encryption. Thankfully they are now encrypted.

I thought I heard something about UK police using a channel hopping routine similar to how Bluetooth works... if you know the channels used at the time, you can still listen in and piece the conversation together... do they still use it, or did they change to a new method?

That wouldn't help people who have cars that already don't do that very sensible thing which yes should be mandatory on all new cars with keyless entry worldwide.