Method and device for accessing a memory to prevent tampering of a program in the memory

摘要

A method and device are provided for accessing a memory of an information processing device in order to prevent tampering to a program in the memory. In one example, the method involves making it difficult to extract inner information inside an integrated circuit (IC) chip via analyzing variations of power consumption of the IC chip. A relationship between address information processed inside the IC chip and the power consumption is made inconspicuous. The Difference between hamming distances of certain memory portions is reduced so as to reduce changes of a program counter in each execution of conditional branch instructions.