Patent ID: 8497763

Claim:
A data carrier comprising: a communication protocol storage unit storing a communication protocol for communicating with an external communication device; an RF analogue receiver receiving an interrogation signal from the external communication device as an RF signal; a contact communication end terminal unit performing contact communication with the external communication device; a communication command controller controlling a command used in an RF communication protocol performed via the RF analogue receiver or a contact-type serial communication protocol performed via the contact communication end terminal unit; a connection selector selectively connecting one of the RF analogue receiver and the contact communication end terminal unit with the communication command controller; a contactless communication command controller controlling a proximity communication command for proximity communication with the external communication device mad a vicinity communication command for vicinity communication with the external communication device; an authentication command analyzer analyzing an authentication level to be applied to the external communication device based on the interrogation signal received from the RF analogue receiver; and an authentication command selector selecting an authentication command used in an authentication process with the external communication device according to an analysis result in the authentication command analyzer, wherein the communication command controller uses the communication protocol stored in the communication protocol storage unit to perform communication in both cases of selecting the RF analogue receiver and the contact communication end terminal unit, and the authentication command includes a command used in “tag authentication” communication, a command used in “mutual authentication” communication, and a command used for “no authentication” communication using a limited memory area.