| 摘要 |
PROBLEM TO BE SOLVED: To make it difficult for estimation processing or a deciphering key from the waveform of power consumption by changing the processing sequence in an IC card chip, so that it cannot be inferred by an attacker. SOLUTION: An information processor is provided with a storage means, which has a program storage part for program storage and a data storage part for data storage, an arithmetic processor, a means which inputs data which is taken as the object of arithmetic processing in the arithmetic processor, and a means which outputs the arithmetic processing result of this data in the arithmetic processor, and a value F(K, A) of a function F which satisfies F(K1+K2, A)=F(K1, A)○F(K2, A), with respect to two integers K1 and K2, is obtained. |
