Patent ID: 8166523

Claim:
An authentication processing method executed in a portable authentication device that includes an infrared light emitting unit used in executing the authentication processing, the method comprising: obtaining biometrics information, comprising a vascular blood vessel pattern, of a person to be authenticated at a portion where the portable authentication device is mounted, wherein obtaining biometrics information reads the vascular blood vessel pattern in a finger or a wrist of the person to be authenticated; executing an individual authentication process within the portable authentication device by the verification of the biometrics information with registered biometrics information stored in a memory of the portable authentication device; receiving a request for individual authentication from an external device that is separate from the portable authentication device; causing the infrared light emitting unit to emit infrared light in order to read the vascular blood vessel pattern of the person to be authenticated for the individual authentication process in response to receiving the request for individual authentication from the external device; and executing a mutual authentication process between the portable authentication device and the external device only when the individual authentication process has been successfully performed according to the biometrics information by the portable authentication device.