Secure Unique NFC SUN Message feature 424 DNA authentication NFC chip tag sticker

Introduction

NFC 424 DNA (NT4H2421Gx) sets a new standard in secure NFC and IoT

applications, introducing a new NFC DNA chip generation with state-of-the-art features

for security and privacy protection. It comes with AES-128 cryptographic operation

and a new Secure Unique NFC (SUN) Message feature to generate tap-unique data

authentication upon each read-out by an NFC enabled mobile device. This enables

most advanced product and content protection, plus secured exclusive user experiences

served in real time.

NFC 424 DNA is fully compliant with the NFC Forum Type 4 Tag IC specification

(Certification ID: 58562), with the contactless proximity protocol according to ISO/

IEC14443-4 and the ISO/IEC 7816-4 based file system and command frames, to ensure

maximum interoperability within the NFC infrastructure. Its NFC performance supports

superior user interaction and reading distances of up to 10 cm.

Using AES-128 cryptography, the tag generates a Secure Unique NFC (SUN) message

for the authentication each time it is being tapped. An NFC mobile device reads this

tap-unique URL with the SUN authentication message, sends it to the host where tag

and message authentication take place, and returns the verification result. The SUN

authentication mechanism is guaranteed to work on Android (without a dedicated app)

and iOS11 (with an app). This way, NFC 424 DNA offers tag authentication, as well as

data assurances on authenticity, integrity and even confidentiality, while also securing

physical tag presence, see also Section 9.3.

The chip has a file-based memory structure of totally 416 bytes (compliant to NFC

Forum Type 4 Tag and ISO/IEC 7816-4) with a Capability Container (CC) file to specify

the NFC Forum tag operation, an NDEF file as well as an extra data file to protect

sensitive content. Configurable access rights per file support different use cases of brand

product manufacturers and service providers to meet specific security and operational

requirements. With 5 customer defined AES keys, NFC 424 DNA enables advanced

cryptographic functionalities – for the CMAC, optionally combined with encrypted data,

for SUN, mutual authentication (secure host or reader authentication) and for secure

access to the NDEF file and the extra data file.

NFC 424 DNA contains configurable features like optionally encrypting part of the

NDEF file, and the fully encrypted communication mode to address privacy sensitive

applications. The optional Random ID together with the encrypted chip UID/data that

can be mirrored in the NDEF file, enables compliance with latest user data protection

regulations.

Besides the standard AES-128 implementation, NFC 424 DNA can also offer an

alternative AES-based protocol for authentication and secure messaging using a Leakage Resilient Primitive, or LRP – a wrapper around the AES cryptography to

enhance side-channel attack resistance.

Thanks to its high input capacitance of 50 pF,  424 DNA tag IC is well suited for

smart product applications requiring smaller footprint antennas, without compromise

on performance. Smaller NFC tags can more easily be embedded in product labels,

modules, caps and closures, and other packaging formats.

Applications of NFC Tags:

Mobile Payment, Access Control Management, E-ticketing, Loyalty System, Marketing and Advertisements, Product Authentication, Retail, etc.

Of course, you have more creative ways on applying NFC tags in various applications.

Format of NFC Tags:

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