Secure Active RFID Tag System

Recently, Radio Frequency Identification (RFID) tags are examined for various usages. Active type of tags which incorporates a battery is being applied to a person to detect the person’s position. Usually, the active tag always widely transmits ID at constant intervals. Therefore, there is a security issue that the radio signal is easily observed from a place away by an uncertain party. The party can easily perceive the existence of the user who has the tag. We report here that we designed a new active RFID tag system that solves such a security issue.