TAG PRIVACY PROTECTION METHOD, TAG DEVICE, UPDATING DEVICE, UPDATE REQUESTING DEVICE, PROGRAMS OF THESE, AND RECORDING MEDIUM STORING THESE PROGRAMS

摘要

PPROBLEM TO BE SOLVED: To prevent an unauthorized person from tracing a tag device distribution process. PSOLUTION: Privileged ID information (sidSBh/SB) obtained by privileging tag ID information (idSBh/SB) of each tag device 1510 is stored in the confidential value memory of each tag device. The tag device 1510 reads privileged ID information (sidSBh/SB) from its confidential value memory and outputs it to the updating device 1560 provided outside each tag device 1510. The updating device 1560 accepts the input of the privileged ID information (sidSBh/SB), creates new privileged ID information (sidSBh/SB') whose relationship with the privileged ID information (sidSBh/SB') is hardly assumed, and outputs the new privileged ID information (sidSBh/SB') to the tag device 1510. The tag device 1510 accepts the input of the new privileged ID information (sidSBh/SB') and stores the new privileged ID information (sidSBh/SB') in the confidential value memory. PCOPYRIGHT: (C)2009,JPO&INPIT