| 摘要 |
PROBLEM TO BE SOLVED: To realize great tamper resistance technique at a comparatively low cost when an H/T using a PKI in a fingerprint collator is made merchandise. SOLUTION: When a power source is supplied, a picture is read from a fingerprint reading sensor 200 and the random number is preserved in an SRAM 140 in an ASIC 100 as a cipher key (for example, a DES key with 56 bits) for seizing a cipher. A data storing flash memory 300, a program storing flash memory 400 and a cipher engine part 500 are arranged at the outside of the ASIC 100. A fingerprint template or important data such as a PKI key are stored in the data storing flash memory 300. The cipher engine part 500 enciphers important data stored in the flash memory 300 through the use of the cipher key which is preserved in the SRAM 140 and also decodes data to be read from the flash memory 300. |
