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
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.
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.
- 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
- 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.
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.
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
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.
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.
- 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
- 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.
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.
