Patent ID: 8109445
Filing Date: 2012-02-07
Classification: G06K,G07C

Abstract:
1. A data carrier constituting a data carrier system with a reader/writer device, the data carrier comprising: a command holding unit where a region thereof to store authentication commands to perform authentication with the reader/writer device is divided into at least three areas, as for the three areas, a first authentication command is stored in a first area, a second authentication command is stored in a second area, and a third authentication command is stored in a third area; a signal reception unit receiving an inquiry signal transmitted from the reader/writer device; an authentication command analysis unit analyzing levels of authentication performed with the reader/writer device from the inquiry signal received by the signal reception unit; an authentication command selection unit selecting the authentication command used in an authentication process performed with the reader/writer device based on an analysis result of the authentication command analysis unit; a command reading unit reading the authentication command selected by the authentication command selection unit from the command holding unit; and a signal transmission unit transmitting the inquiry signal in which the authentication command read by the command reading unit is used to the reader/writer device.