| 摘要 |
<P>PROBLEM TO BE SOLVED: To make an illegal analysis of authentication information difficult by suppressing an increase in the processing load of a CPU in a peripheral unit even if authentication is performed with one classification of authentication information. <P>SOLUTION: A main control unit generates data for authentication including an checkup value corresponding to a data classification when determining the next data classification when classification information is data for authentication. Further, the main control unit generates data for changing an expectation value for changing an expectation value and changes the checkup value when the classification information is data for changing an expectation value. The main control unit generates authentication information including the generated data for authentication or data for changing an expectation value for transmitting to a subsequent stage unit. When the data classification of the classification information at the subsequent stage side is data for changing an expectation value, the subsequent stage unit compares the data for authentication of the received authentication information with the expectation value, and generates the authentication result data of the subsequent stage indicating the authentication result of the main control unit based on the determination result for transmitting to the peripheral unit. The subsequent stage unit changes the expectation value based on the data for changing an expectation value of the authentication information when the data classification of the classification information at the subsequent stage is data for changing an expectation value. <P>COPYRIGHT: (C)2012,JPO&INPIT |
