Modern Car Remote Control Key Helps Improve Safety
Nov. 09, 2018
With the remote keyless-entry systems that you find on cars today, security is a big issue. If people could easily open other people's cars in a crowded parking lot at the mall, it would be a real problem. And with the proliferation of radio Scanners, you also need to prevent people from "capturing" the code that your transmitter sends. Once they have your code sends. Once they have your code, they can simply re-transmit it to open your car.
The controller chip in any modern controller uses something called a hopping code or a rolling code to provide security. For example, if you read this PDF, it describes a system that uses a 40-bit rolling code.
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