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Anyone have any experience in breaking rolling code key fobs?

Decided to clone my garage door clicker and aside from the obvious playback attack I'm not really sure how you'd go about extracting the secret from the hardware.

Captured a few radio packets, seems like a 4 btye code. Not game enough to open a 400 dollar fob with no clones on the market to see what chip is driving it. Any way to identify it?

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