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Fending Off Evil

It's 3AM, and you wake unexpectedly. They're out there... the Evildoers. You can almost feel them. They're out there right now holding a copy of your latest board - with the FPGA sitting right in the middle. It's the same one you put in your design. Reverse-engineering the board is easy - or heck, they may just have a way to sneak a few off the assembly line where they're being made. You know the place - you were nervous when purchasing made the deal. The prices were a little too low and the opacity was a bit too high. That's why you have it set up so your FPGA bitstream doesn't get loaded until the product gets back to your facility.

Nonetheless, they're out there. They're looking at your board right now, and they're trying to figure out how they can steal your design - or your customers' data. You took precautions, of course. Maybe your bitstream is encrypted with the FPGA-vendor's security features. Your customers' data is definitely encrypted. You can go back to sleep now, right? They won't be able to get your encryption keys.