A security circuit for a reprogrammable logic IC includes an evolved circuit
that
ties the performance of the security circuit to the physical properties of that
particular reprogrammable logic IC. The security circuit can be a decryption and/or
encryption circuit that decrypts and/or encrypts, respectively, a configuration
bitstream for the IC. Because of the link between the performance of the security
circuit and the physical properties of the IC, the security circuit cannot be used
in other ICs. For example, an encrypted bitstream that can be decrypted by the
security circuit in a first IC will typically not be decrypted by the same security
circuit in a second IC, since the physical properties of the two ICs will typically
be different. The evolved circuit can comprise a portion of the security circuit,
such as a security key generator, or it can comprise the full security circuit.
