| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a data processor making estimation of security information by power consumption analysis or the like difficult. <P>SOLUTION: A CPU 1 sets a random number generated by a random number generator 3 in an area of a memory 2 before setting an input value to be provided to a coprocessor 4 in an area of the memory 2. Accordingly, a value of the memory 2 is not fixed before and after shifting to arithmetic processing, and a change of a state cannot be extracted by statistical processing such as power consumption analysis, so that the estimation of the security information can be made difficult. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
