| 摘要 |
PURPOSE: To provide an information processor with high anti-tamper performance applied to an IC card having high security, etc. CONSTITUTION: The information processor of this invention is characterized in that the processor has at least a means to enter a signal, a storage section that stores a program, an arithmetic section that conducts prescribed data processing according to the program, and a means that outputs the signal, the program stored in the storage section has one or more data processing instructions to give an execution instruction to the arithmetic section, and at least one of the data processing instructions has a step where, in the case processing the data signal received by the data entry means, the arithmetic operations conducted by using a signal A and a signal B for a desired calculation in data processing are conducted in a way such that the signal A or B is devided once and the desired calculation is applied to the devided A and B, and the arithmetic operation are individually conducted, then the individual arithmetic operations are summed to obtain a correct encryption signal.
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