secure integrated circuit with shared confidential nature and methods for their operation

摘要

The secured integrated circuit (1) has memories (2) for recording confidential data such as coding programs and keys which are operated by a microprocessor (3). A generator of random numbers (6) is connected through the microprocessor to an oscillator stage (4,5) which produces clock signals at a frequency depending on the random number. A timer (7) interrupts the microprocessor at intervals which also depend on the random number. An Independent claim is also included for: A method of operating a secured integrated circuit which uses random numbers to protect confidential data