Tamper-proof method and circuit for a register of an integrated circuit containing data obtained from secret quantities

摘要

The piracy protected circuit includes source and destination registers (2,3,2',3') connected to input and output of an operator (4). A pair of temporary registers (6,7) store the content of the source register or the result of the operator before transfer to the destination register. A controller loads a random or pseudo random number to the destination register before transfer of the result. An independent claim is also included for anti-fraud method for integrated circuit.