ADDRESS DEPENDENT DATA ENCRYPTION

摘要

Encryption of data within a memory 6 is provided by key generation circuitry 12 which serves to generate a key as a function of the address within the memory 6 being accessed and then encryption circuitry 14 or decryption circuitry 16 which serve respectively to encrypt or decrypt the data as a function of the key that has been generated based upon the address. The encryption and the decryption may be performed using a bitwise XOR operation. The key generation circuitry may have the form of physically unclonable function circuitry, which varies from instance to instance of implementation and that operates to generate the same key for the same address upon both write and read operations within the same instance.

主权项

1. Apparatus comprising:
memory to store encrypted data representing unencrypted data at a storage location specified by an address; key generation circuitry to generate a key as a function of said address; encryption circuitry to encrypt said unencrypted data to form said encrypted data as a function of said key; wherein the key generation circuitry comprises physically unclonable function circuitry, said address is a challenge input to said physically unclonable function circuitry, and said key is a response output from said physically unclonable function circuitry.