| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a portable electronic apparatus and an IC card which can make a power analysis attack to significant data such as a password in particular difficult and improves tamper-resistant performance. <P>SOLUTION: The IC card for determining whether the owner of the IC card is a legal owner by checking whether a registered password coincides with a password inputted from the outside, wherein the password is registered as specific information of authentication in a nonvolatile memory is provided with a plurality of verification processing means which check whether a password inputted from the outside coincides with a previously registered password and respectively have different checking methods, selects one optional verification processing means among the plurality of verification processing means each time verification processing is executed and executes verification processing by using the selected verification processing means. <P>COPYRIGHT: (C)2009,JPO&INPIT |
