Atmel : New cryptographic chip ATECC508A secures smart, connected and IoT systems


ATECC508A: highly secure hardware-based key storage

Atmel has made a breakthrough in the provision of security functionality for Internet of Things (IoT) devices and other connected systems with the ATECC508A, a member of its CryptoAuthentication™ product family.

The Atmel® ATECC508A is the first device to implement the Elliptic Curve Diffie-Hellman (ECDH) security protocol – an ultra-secure method for providing key agreement when encrypting and decrypting data shared between two devices – in a small, low-power device suitable for use in IoT equipment. It also implements the Elliptic Curve Digital Signature Algorithm (ECDSA) to provide for sign-verify authentication.

The CryptoAuthentication portfolio now includes two series of devices offering advanced Elliptic Curve Cryptography (ECC) capabilities. Because the new ATECC508A has ECDH and ECDSA built-in, it enables design engineers to easily provide confidentiality, data integrity and authentication in systems that use a microcontroller or microprocessor running encryption/decryption algorithms such as Advanced Encryption Standard (AES) in software.

Like all Atmel CryptoAuthentication products, the new ATECC508A employs hardware-based cryptographic key storage and cryptographic counter-measures, which are more secure than software-based key storage.

It is compatible with any MCU or MPU on the market today. Drawing a typical current of just 3mA in Active mode, it consumes very little power, and requires only a single general-purpose


  • Support for X.509 certificate formats
  • 256-bit SHA/HMAC hardware engine
  • Multi-level random number generation
  • Guaranteed unique 72-bit identity
  • 150nA maximum stand-by current
  • 10.5kbits EEPROM for secret and private keys


  • Home automation
  • Industrial networking
  • Authentication of accessories and consumables
  • Medical equipment
  • Mobile devices