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Your scheme is not secure as you're sending the private key of the server over the wire (in your first step). Extension (after update of question) The scheme is still not secure as now I can intercept the public key from the server and replace it with my own certificate (Man-in-the-Middle-Attack). To secure your scheme you have to use a CA (even you can ...


First, start by reading the answer to this question-> https://crypto.stackexchange.com/questions/18311/how-does-a-rolling-code-work This answers your first two questions. Also, the transmitter does not periodically send an RF signal, as what starts the authentication conversation is a key fob, not the car. The only way to break out of the sequence would be ...

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