Counterfeiting has grown tremendously over the last decade. Fortunately, there are several anticounterfeiting solutions. Of these, an authentication based on challenge-response allows a much stronger protection than secure printing or unique ID RF tags. This application note presents the benefits of RFID tags based on crypto-strong authentication. It explains how these benefits enable the consumer to check for the authenticity of luxury goods by simply tapping their near-field communication (NFC)-enabled phones.