| 摘要 |
<P>PROBLEM TO BE SOLVED: To make fraudulence analysis of authentication hard while suppressing an increase in processing load on a CPU of a peripheral part even when authentication is performed by one kind of authentication information. <P>SOLUTION: When a main control unit switches a data class, it extracts a first test value or a second test value corresponding to the data class of authentication information to be generated next time. When the main control unit does not switch the data class, it extracts a third test value. When the main control unit generates authentication data having any one of the extracted first to third test values or generates expected value changing data, it generates authentication information having the authentication data or the expected value changing data and transmits the generated authentication information to a back stage part. The main control unit changes test value to be changed shown by information to be changed, associated with the first test value or the second test value in advance, on the basis of the generated expected value changing data. On the other hand, the back stage part authenticates the main control unit according to the received authentication data of authentication information and expected value when the data class of back stage side class information is one for authentication data. <P>COPYRIGHT: (C)2012,JPO&INPIT |
