RADIO TAG PRIVACY PROTECTION METHOD, RADIO TAG DEVICE, SECURITY SERVER, PROGRAM FOR RADIO TAG DEVICE, AND PROGRAM FOR SECURITY SERVER

摘要

PROBLEM TO BE SOLVED: To provide a novel technology for avoiding such an attack as information transmitted from a radio tag is tapped and reused.

SOLUTION: A reciphered ID is formed by re-encrypting a ciphered tag ID stored in a radio tag using an encryption key, temporary information capable of being agreed by a server is formed, authentication information is formed for formation objects of the reciphered ID, the temporary information and the ID of a decryption key being shared among a plurality of radio tags and used for decrypting the reciphered ID, and then the decryption key ID, the temporary information and the authentication information are added to the reciphered ID to form tagged transmission information which is transmitted to the server. The server acquires the tagged ID by decrypting the reciphered ID using the decryption key obtained from the decryption key ID, verifies correctness of the tagged transmission information using an authentication information verification key and the authentication information obtained from the tagged ID and makes a decision whether the temporary information has an appropriate value or not.

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