发明名称 |
TAG PRIVACY PROTECTING METHOD, TAG DEVICE, BACKEND DEVICE, UPDATING DEVICE, UPDATE REQUESTING DEVICE, PROGRAMS FOR THESE DEVICES, AND RECORDING MEDIUM STORING THESE PROGRAMS |
摘要 |
According to a first invention, in response to an access from a reader, a tag device causes its second calculator to read a confidential value from a confidential value memory and to apply a second function F2 which disturbs a relationship between elements of a definition domain and a mapping thereof to generate tag output information. The tag output information is fed to an output section, which then delivers it to a backend apparatus. Subsequently, a first calculator reads out at least part of elements of the confidential value from the confidential value memory, and applies a first function F1, an inverse image of which is difficult to obtain, and a result of such calculation is used to update a confidential value in the confidential value memory by overwriting. According to a second invention, an updater which is provided externally of a tag device updates privileged ID information stored in a tag device into new privileged ID information, the association of which with the privileged ID information is difficult to follow, at a given opportunity.
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申请公布号 |
EP1669877(A1) |
申请公布日期 |
2006.06.14 |
申请号 |
EP20040788209 |
申请日期 |
2004.09.27 |
申请人 |
NIPPON TELEGRAPH AND TELEPHONE CORPORATION |
发明人 |
OHKUBO, MIYAKO;SUZUKI, KOUTAROU;KINOSHITA, SHINGO |
分类号 |
G06F12/14;G06F21/00;G06K17/00;G06K19/073;H04L9/32;(IPC1-7):G06F12/14 |
主分类号 |
G06F12/14 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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