Importance

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Abstract

A transponder includes a data memory and a mechanism for contactless interaction with a base station. The transponder is brought (1) into an active field of the base station. Before the transponder is deactivated (7) by the base station by the transfer of a command signal (5), the authorization of the base station for deactivation (7) is checked (4). Before the transfer of the command signal (5) an admission signal which contains first admission information is transmitted (3) from the base station to the transponder. The first admission information with second admission information stored in the data memory is processed by the transponder into authorization information. Based on the authorization information it is decided (4) whether the command signal is accepted (7) or rejected (8). Thus the transponder while keeping secret the data present in the transponder may be reliably deactivated (7) or reactivated.

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First Claim