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I mean, you can use 2 pins of your FPGA for checking a presence of hidden connection on PCB. Thus, your PCB can act as a "key".
Anyway, routing PCB you can easy put a secret wire into internal layer.
I do not quite agree. The vertical fuses used by Actel makes it virtually impossible to 'see' the content of this kind of FPGAs. Beside they are radiation hardened, therefore X-ray analysys does not work.
Their Flash based FPGA's takes away the burden of prototyping and you can (if really required) transfer your design to a fuse base one.
Cheers.
tahiti said:
This is not true. A chip, especially fuse based devices, can be reingineered, if someone is willing to invest a significant amount of money.
And, as far as I know 3DES can be cracked, if you have extremely large computing power.
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