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 for a working reference implementation.