US 2006/0223500 A1 · AUTHENTICATION SYSTEM

Abstract

In some preferred embodiments, in an authentication system including a plurality of portable devices and a base station, if the portable device is operated by an internal battery, ID data encrypted at a higher level are exchanged (normal mode), and if the portable device is operated by electromagnetic induction coupling with the base station, ID data encrypted at a lower level are exchanged (backup mode). These two communication modes are performed in the same communication device. The portable device transmits a signal showing a state of the battery voltage to the base station, and the portable device and the base station store the battery state in the respective storing portions. At the time of initiating communication, the portable device transmits a signal in the normal mode as first communication. If there is no response from the portable device, the portable device refers to the storing portion, and only if there is a portable device insufficient in voltage, the base station shifts communication in the backup mode.

Claims16

Dependent claims

An authentication system, comprising:

a base station;
and
a portable device powered by electric power supply by a battery or electromagnetic induction coupling with the base station,
wherein the portable device includes:
a detecting portion configured to detect a voltage of the battery;
a storing portion configured to store data showing an ID code peculiar to the portable device;
a transmitting portion configured to transmit a signal including the ID code, or the ID code and data showing a detection result of the detecting portion;
and
a receiving portion configured to receive a signal transmitted by the base station, and
wherein the base station includes:
a storing portion configured to store an ID code peculiar to the base station;
a transmitting portion configured to transmit a signal including the ID code peculiar to the base station to the portable device;
a receiving portion configured to receive the signal transmitted by the portable device;
and
a controlling portion configured to obtain data showing the ID code peculiar to the portable device or the detection result from the signal received by the receiving portion of the base station, wherein when the ID code peculiar to the portable device is obtained, the controlling portion of the base station collates the ID code peculiar to the portable device with the ID code peculiar to the base station and stores the data showing the detection result in the storing portion of the base station.

12 more elements

Dependencies are inferred from the claim text.

Authentication system

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Authentication system

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Abstract

Claims16