Patent ID: 7904839

Claim:
A circuitry access system for controlling access to addressable circuit elements of an integrated circuit, each circuit element having an address, the system comprising: a first storage element having a first listing of unique identifiers, each identifier representing one of the addressable circuit elements; a selector in electrical connection with said first storage element for distinguishing a first subset of unique identifiers from said first listing of unique identifiers, the first subset representing circuit elements allowed to be addressed by a user; and a second storage element in electrical connection with said selector for receiving said first subset and storing said first subset in an arrangement that does not include an indication of the absence of any unique identifier of the first listing that is not included in said first subset, said second storage element including an output for allowing the user of the integrated circuit to access one or more of the addressable circuit elements corresponding to said first subset of unique identifiers without allowing the user to identify any unique identifier of the first listing that is not included in said first subset.