| 摘要 |
PROBLEM TO BE SOLVED: To make it difficult to analyze secret information based on the measurement of current consumption or electromagnetic waves. SOLUTION: The operations of a program counter block 12 and a register block 17 are switched according to a switching signal S outputted from a time- division processing controlling part 19, and real processing based on secret information held in a flash memory 15 and false processing which does not use the secret information is executed in time-vision parallel. Thus, the influence of the false processing is mixed with current consumption or electromagnetic waves so that the secret information can be made difficult to analyze from the current consumption or the electromagnetic waves at that time. Also, hardware to be used for the processing is switched according to the switching signal S, and the time-division parallel processing is operated so that high speed processing can be realized by making it unnecessary to operate switching processing by software processing. Moreover, plural common hardware is used for the real processing and the false processing so that the secret information becomes more difficult to be analyzed. |
