M5Stack U124 UNIT ID Crypto Authentication Unit

m5Stack U124 UNIT ID Crypto Authentication Unit is a crypto coprocessor with hardware-based secure key storage, integrated with ATECC608B hardware cryptographic chip, using an I2C communication interface. The chip has a built-in 10Kb EEPROM for storing keys, certificates, data, consumption records, and security configurations. The configuration can be locked to prevent changes by restricting access to memory areas.

Each ATECC608B comes with a guaranteed unique 72-bit serial number and includes several security features to prevent attacks on the device itself or logical attacks on data transferred between devices. The device supports the Trust&GO platform (pre-built universal certificate for TLS-based network security authentication, such as AWS-IoT, Azure, Google, and other cloud platforms to verify registration). The internal certificate of the encryption chip can be obtained directly through the tool to complete the automatic registration without essential private exposure.

It is recommended before using this UNIT ID that the user should read the ATECC508B datasheet, which only allows configuration before locking the chip. If the user needs to explore the full functionality, it is recommended to purchase multiple m5Stack UNIT IDs for authentication.


  • I2C communication interface
  • Protective cover for extra stability and reliability
  • Protected storage of up to 16 keys, certificates, or data
  • Data storage/locking
  • Random number generator
  • Preset certificates and keys
  • 72-bit unique serial number


  • Encryption chip model - ATECC608B-TNGTLSU-G
  • Supported algorithm types
    • ECC-P256 (ECDH and ECDSA)
    • SHA256
    • AES128-GCM
  • Communication interface (I2C, address: 0x60, bus max speed 1Mbps)
  • 16 supported key storage
  • 5V DC power supply voltage
  • Net weight (3.2g)
  • Gross weight (8.3g)
  • 24mm x 24mm x 13mm product dimensions
  • 35mm x 36mm x 18mm package size

Kit Contents

  • 1x Unit ID
  • 1x HY2.0-4P cable


  • IoT endpoint key management and exchange
  • Device authentication
  • Data encryption
Publicado: 2021-10-26 | Actualizado: 2022-03-11