| 摘要 |
<P>PROBLEM TO BE SOLVED: To achieve an arithmetic configuration that makes analysis based on transient transition difficult and has high resistance, for example, to DPA attack. <P>SOLUTION: An arithmetic unit applies a logic circuit for performing data conversion processing, such as the nonlinear conversion processing and linear conversion processing of an input bit, and generates an output bit. In this case, input bit transition processing that is the switching processing of the input bit to the logic circuit is executed in a precharge phase, where the output of the logic circuit is maintained at a fixed value, and transition to an evaluation phase is made after input bit transition processing is completed for performing the generation processing of the output bit based on the data conversion processing, thus making difficult the analysis based on the transient transition occurring in the input bit transition processing, and achieving the arithmetic unit having high resistance, for example, to the DPA (Differential Power Analysis) attack. <P>COPYRIGHT: (C)2008,JPO&INPIT |
