# NTAG424 DNA NFC Tags - Secure Authentication

Unclonable NFC tags: Each tap generates unique encrypted signature. AES-128 security for authentication & anti-counterfeiting. 47x78mm PET.

- **Seller:** [Randware](https://lectronz.com/stores/randware), Phoenix, Arizona, United States
- **Price:** $2.50 (USD, before shipping and taxes)
- **Availability:** In stock
- **Categories:** Components, Prototyping, Technology
- **Product page:** https://lectronz.com/products/ntag424-dna-nfc-tags-secure-authentication

## Links

- [Documentation](https://www.nxp.com/products/rfid-nfc/nfc-hf/ntag-for-tags-and-labels/ntag-424-dna-424-dna-tagtamper-advanced-security-and-privacy-for-trusted-iot-applications:NTAG424DNA)

## Images

![NTAG424 DNA NFC Tags - Secure Authentication](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6Mzc2MjEsInB1ciI6ImJsb2JfaWQifX0=--dbabd1b253353daae1c9410e21fd35a0ae76fc99/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/2025-09-18T15-3A25-3A04.834Z-ntag424.jpg)
![NTAG424 DNA NFC Tags - Secure Authentication](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6Mzc2MjIsInB1ciI6ImJsb2JfaWQifX0=--244005238ba05098666ce9c54b52bb18556e16db/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJwbmciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--605f1da017bcbb03ce31845cd0e81d97e3b3c574/2025-09-18T15-3A25-3A04.834Z-ntag424_antimetal.png)
![NTAG424 DNA NFC Tags - Secure Authentication](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6Mzc2MjMsInB1ciI6ImJsb2JfaWQifX0=--fdbe6f01649cbf303a5468f3791f4c14f673203a/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/2025-09-17T23-3A06-3A15.026Z-PXL_20250624_070532402.MP.jpg)
![NTAG424 DNA NFC Tags - Secure Authentication](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6Mzc2MjQsInB1ciI6ImJsb2JfaWQifX0=--6c9a846296ddaebb839ca2488e2b4294ea03393f/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/2025-09-17T23-3A06-3A15.026Z-PXL_20250624_070506635-20-281-29.jpg)

## Description

Cryptographically secure NFC tags with dynamic authentication. Each tap generates a unique, unclonable signature. Perfect for loyalty programs, product authentication, and secure access systems.

## What is it?

A professional-grade NFC tag that generates a unique encrypted authentication code with every single tap. Unlike standard NFC tags that broadcast the same data repeatedly (making them trivial to clone), these use AES-128 encryption to create dynamic, tap-unique signatures that can't be replicated.

Two variants available:

- Standard: 47x78mm wet inlay on PET material - ideal for most applications
- Anti-metal: Same size with special shielding layer - works on metal surfaces where regular tags fail

## Why did I make these available?

I use these for StampCards.com, where cloning prevention and anti-replay is critical for a secure loyalty program. Standard NFC tags are fine for basic automation, but any system involving value exchange needs real security. The NTAG424 DNA has bank-grade security that works on both iPhone and Android without app downloads.

Most suppliers require bulk minimum orders to get reasonable pricing. I am making these accessible for small-scale testing and deployment.

## What makes it special?

**Dynamic authentication that actually works:** Every tap generates a new cryptographic signature using the chip's hardware AES engine. Even if someone intercepts your URL, they can't replay it.
Zero-app authentication: The secure code embeds directly in the URL via the SUN (Secure Unique NFC) message feature. iPhone users can authenticate without downloading anything—just tap and Safari handles it.

**Hardware security:** Authentication keys are stored in protected memory with EAL4+ certification. No software exploit can extract them.

**Privacy features:** Optional random UIDs prevent tracking between taps. The chip can rotate identifiers while maintaining authentication integrity.

**Proven in production:** These exact chips secure everything from pharmaceutical supply chains to luxury goods authentication. Now available for your projects.


## Technical Details:

- Chip: NTAG424 DNA
- Encryption: AES-128 with CMAC
- Memory: 416 bytes total (3 files: 32B, 256B, 128B)
- Standards: ISO14443A, NFC Forum Type 4
- Frequency: 13.56MHz
- Read range: ~3-5cm (typical)
- Size: 47x78mm
- Material: PET substrate
- Operating temp: -25°C to +70°C


## Use cases:

- Loyalty programs that need fraud prevention
- Product authentication (prove it's genuine)
- Secure access control without key cards
- Event ticketing with transfer protection
- Supply chain verification
- Interactive marketing with unique user experiences


Each tag is tested before shipping from Arizona.


## Implementation notes:

These tags require server-side authentication to verify the cryptographic signatures. Example backend code and setup guides available on request. See [Ntag424Api.com](https://ntag424api.com/) for a working reference implementation.