SECURITY ENHANCEMENT IN A DATA PROCESSOR THROUGH USE OF DYNAMIC PARAMETER AUTHENTICATION

摘要

A descrambler for descrambling scrambled information signals throughuse of a predetermined decryption key includes processing means and a memoryfor storing data for use in said data processing routines. The processingmeansare adapted for processing data in accordance with a number of different dataprocessing routines to descramble said scrambled information signals,including aroutine for descrambling said scrambled information signals that utilizes saidpredetermined decryption key, and a routine for generating said predetermineddecryption key. The processing means includes means for responding to aninstruction for generating said predetermined decryption key by processing afirstsignal provided by the processing means with a second signal to generate saidpredetermined decryption key; and means for providing at least a portion ofsaidsecond signal for processing with said first signal by retrieving a portion ofsaidstored data from a portion of said memory identified by a dynamic pointercontained in said instruction for generating said decryption key, with saidretrieveddata being data that is also used in a said data processing routine other thansaidroutine for generating said predetermined decryption key.