| 摘要 |
A cryptography processing device has: a round processing unit configured to obtain a processing-object data and generate an intermediate data by applying round processing to the processing-object data; a random number generation unit configured to generate a random number data; a memory circuit in which the intermediate data or the random number data is stored; and a selection control unit configured to select which one of the intermediate data and the random number data is to be stored in the memory circuit. The selection control unit selects the data to be stored in the memory circuit such that the random number data is stored after the intermediate data is stored.
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