Resources

Standards & References

The standards and reference documents the SEKUREX Core hardware and Tap Maestro platform operate against.

  • NXP NTAG 424 DNA Datasheet

    NT4H2421Gx — RF interface, memory, security architecture.

    Source datasheet referenced for the silicon used in both SEKUREX Core SKUs.

  • NXP AN12196 — Secure Dynamic Messaging

    SUN authentication, CMAC, AES-128 padding.

    Reference application note for SDM/EV2 encoding patterns.

  • ISO/IEC 14443-3A / 14443-4

    Anticollision + T=CL transport.

    RF transport standards governing NTAG 424 DNA operation.

  • ISO/IEC 7810 ID-1

    Card form factor for SC-424-PVC-GL.

    Geometry standard for the SEKUREX Core PVC card SKU.

  • ISO/IEC 7816-4

    APDU command structure.

    Application-protocol layer used over the NFC interface.

  • Tap Maestro — Edge Functions & Key Vault

    Supabase Edge Functions + Edge Vault.

    Tap Maestro systems use Supabase Edge Functions for low-latency execution and the Supabase Edge Vault for cryptographic key storage. Keys never touch the client.

  • Tap Maestro — Audit Report Storage

    Object storage container for automated reports.

    A dedicated storage container persists automated, audit-ready reports as they are generated — making historical inspection ledgers retrievable on demand.

  • Tap Maestro — Client Deployments

    Cloudflare SSL/TLS encryption, standard.

    Every dashboard, form, and submission endpoint deployed through the SEKUREX network uses enterprise-grade Cloudflare SSL/TLS encryption as a standard feature.

Quick Specification Snapshot

NXP NTAG 424 DNA

RF Interface
Operating Frequency 13.56 MHz
Modulation ASK 100% (ISO 14443-3A)
Bit Rate 106 kbit/s
Anticollision ISO/IEC 14443-3A
T=CL Protocol ISO/IEC 14443-4
NFC Forum Type Type 4 Tag
Memory & Storage
Total User Memory 416 bytes EEPROM
UID 7 bytes — factory-programmed
Data Files 3 (File 01, 02, 03)
SDM Read Counter 24-bit (per SDM message)
Write Endurance 200,000 write cycles (min.)
Data Retention 10 years
Security Architecture
Cipher AES-128
MAC Scheme AES-128 CMAC
Auth Scheme SUN (SDM / EV2)
Key Count 5 keys (1 master + 4 file)
Padding (AN12196) CSPRNG random bytes
APDU Standard ISO/IEC 7816-4
Operational Standards
Chip Manufacturer NXP Semiconductors
Assembly & QC SEKUREX CORE
Encoding Reference AN12196
Datasheet Ref. NT4H2421Gx
Grade Industrial / Enterprise