| 摘要 |
PROBLEM TO BE SOLVED: To discriminate the fact that the same pressed fingerprints are continuously inputted and are not matched with each other by collation as unauthorized use by storing an input ID number and pressed fingerprint data discriminated as noncoincidence by the collation. SOLUTION: When an unauthorized user inputs an arbitrary ID number (S10) and presses a fingerprint (S11), fingerprint data corresponding to the ID number are read out and collated (S12), and in the case of noncoincidence (S13), the pressed fingerprint data and the ID number are stored in a memory (S17). Next, when operation is returned to the beginning and the same person inputs the arbitrary ID number and presses the fingerprint again (S19 and S11), processing similar to the last time is performed, the (first) fingerprint data stored in the memory are collated with second fingerprint data (S18), and in the case of coincidence (S19), the first input ID number is continuously collated with the second ID number (S20). In the case of noncoincidence as the result of collation (S21), processing for unauthorized use is performed by regarding collation processing over plural ID numbers is performed with the same fingerprint (S22).
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