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Microchip ATECC608B Fully Customizable Secure Element

Network and accessories secure authentication

The ATECC608B by Microchip is a secure element from the Microchip CryptoAuthenticationTM portfolio with advanced Elliptic Curve Cryptography (ECC) capabilities. With ECDH and ECDSA being built right in, this device is ideal for the rapidly growing IoT market by easily supplying the full range of security such as confidentiality, data integrity, and authentication to systems with MCU or MPUs running encryption/decryption algorithms.

The ATECC608B integrates ECDH (Elliptic Curve Diffie Hellman) security protocol an ultra-secure method to provide key agreement for encryption/decryption, along with ECDSA (Elliptic Curve Digital Signature Algorithm) sign-verify authentication.

Similar to all Microchip CryptoAuthentication products, the new ATECC608A employs ultra-secure hardware-based cryptographic key storage and cryptographic countermeasures which eliminate potential backdoors linked to software weaknesses.


  • Cryptographic co-processor with secure hardware-based key storage
  • Protected storage for up to 16 Keys, certificates or data
  • ECDH: FIPS SP800-56A Elliptic Curve Diffie-Hellman (ECDH)
  • NIST standard P256 elliptic curve support (ECC)
  • Hardware support for symmetric algorithms
  • SHA-256 & HMAC hash including off-chip context save/restore
  • AES-128: encrypt/decrypt, galois field multiply for GCM
  • Networking key management support
  • Turnkey PRF/HKDF calculation for TLS 1.2 & 1.3
  • Ephemeral key generation and key agreement in SRAM – Small message encryption with keys entirely protected
  • Secure boot support


  • Full ECDSA code signature validation, optional stored digest/signature – optional communication key disablement prior to secure boot
  • Encryption/Authentication for messages to prevent on-board attacks
  • Internal high-quality FIPS 800-90 A/B/C Random Number Generator (RNG)
  • Two high-endurance monotonic counters
  • Guaranteed unique 72-bit serial number
  • Two interface options available
  • High-speed single pin interface with One GPIO pin
  • 8-pad UDFN, 8-lead SOIC, and 3-lead CONTACT packages
  • Operating temperature up to 100C
  • <150nA Sleep current
  • 1.8V to 5.5V IO levels, 2.0V to 5.5V supply voltage
  • 1MHz Standard I2C interface


Trust Platform

To help accelerating development, discover the Trust Platform for the ATECC608B:

  • ATECC608B Trust&GO for TLS based network secure authentication. The device comes pre-provisioned secure element with a generic static certificate to reduce third party certificate authority costs. No configuration needed allowing you to focus solely on your application code. Compatible with AWS IoT Multi-account registration architecture.
  • ATECC608B Trust&GO for LoRaWAN based networks. The device comes pre-provisioned secure element with The Things Industries or Actility join server symmetric keys depending on the part number chosen. In addition, IEEE addresses are also part of the pre-provisioned device.
  • ATECC608B TrustFLEX for TLS based network secure authentication in addition to many more use cases. The device comes pre-configured device with more use cases than just the device to cloud secure authentication Trust&GO offer. It offers pre-architected implementation for accessory authentication, firmware validation, secure boot assistance, key rotation and more. Compatible for AWS IoT, Microsoft Azure, Google Cloud Platform and in general any TLS networks with code examples for WolfSSL, mBedTLS, CycloneSSL.
  • ATECC608B TrustCUSTOM secure element is a fully customizable device in case your security architecture demands to go beyond the Trust&GO and TrustFLEX use cases.
  • For Linux systems, the Trust Platform ATECC608B variances leverage the PKCS#11 interface between the microprocessor and the secure element. Check our code example.