Contactless secured NFC tag Our contactless NFC4TC304 NFC tag is designed to meet higher levels of security such as those required for authentication applications. The tag incorporates the CIPURSE™ V2 open-standard security architecture and is compliant with the CIPURSE™ V2 cryptographic protocol specification based on AES-128. Commands and transmitted data can be secured using this protocol, which is inherently resistant to physical attacks like DPA and DFA.