Importance

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Abstract

Described are a method of programming a programmable logic device using encrypted configuration data and a programmable logic device (PLD) adapted to use such encrypted data. A PLD is adapted to include a decryptor having access to a non-volatile memory element programmed with a secret decryption key. Some or all of the decryptor can be instantiated in configurable logic on the FPGA. Encrypted configuration data representing some desired circuit functionality is presented to the decryptor. The decryptor then decrypts the configuration data, using the secret decryption key, and configures the FPGA with the decrypted configuration data. Some embodiments include authentication circuitry that performs a hash function on the configuration data used to instantiate the decryptor on the PLD. The result of the hash function is compared to a proprietary hash key programmed into the PLD. Only those configuration data that produce the desired hash result will instantiate decryptors that have access to the decryption key.

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First Claim