Secure element for Sigfox LPWAN network


The STSAFE-A1SX is a secure element that comes preloaded with Sigfox network keys, and provides secure services for data exchanges on the Sigfox’s low-power wide-area network (LPWAN). It constitutes a plug-and-play solution that allows Sigfox Ready™ IoT (Internet of things) devices to connect to the Sigfox network while ensuring data integrity and confidentiality. The STSAFE-A1SX is a highly secure, tamper-resistant solution that relies on a certified, secure EAL5+ Common Criteria chip, on top of which runs a dedicated secure operating system.

Key Features

  • Data integrity over the Sigfox network:
    • Signature of payloads before uplink
    • Verification of downlink payloads
  • Optional data confidentiality over the Sigfox network:
    • Encryption of payloads before uplink
    • Decryption of downlink payloads
  • Security features
    • Latest generation of highly secure MCUs
      • CC EAL5+ AVA_VAN5 Common Criteria certified
      • Active shield
      • Monitoring of environmental parameters
      • Protection mechanism against faults
      • Unique serial number on each die
      • Protection against side-channel attacks
    • Advanced symmetric cryptography
      • AES-128
    • Secure operating system
      • Secure STSAFE-A1SX kernel for authentication and data management
      • Protection against logical and physical attacks
  • Hardware features
    • Highly secure MCU platform
    • 6kB of configurable non-volatile memory
      • Highly reliable CMOS EEPROM technology
      • 30 years data retention at 25°C
      • 500.000 erase/program cycles endurance at 25°C
      • 1.62V to 5.5V continuous supply voltage
  • Protocol
    • I²C-bus slave interface
      • Up to 400kbps transmission speed (Fast mode) and true open-drain pads
      • 7bit addressing


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