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Re:Ask HN: Why do we still have replay attacks on our cars? by wruza on Thursday March 16, 2023 @04:06AM (#35179400)
How complex would a device have to be to not be trivially defeated by a replay attack?

Around $5 complex (though I lost track of actual prices for few years).

How do you get both ends to reliably communicate

You choose a suitable networking stack and communicate. Secure messaging is a solved problem and doesn’t require “internet”.

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