Adafruit ATECC608 Breakout Board - STEMMA QT / Qwiic

The ATECC608 is the latest crypto-auth chip from Microchip, and it uses I2C to send/receive commands. Once you 'lock' the chip with your details, you can use it for ECDH and AES-128 encrypt/decrypt/signing. There's also hardware support for random number generation, and SHA-256/HMAC hash functions to greatly speed up a slower micro's cryptography commands. We're starting to see these low-cost secure element chips in various products, so that a less expensive chip can be used to drive peripherals, without worrying about security. This chip does not have a public datasheet, but it is compatible with the ATECC508 earlier version which does, so please refer to that complete datasheet as well as the ATECC608 summary sheet. The good news is that, despite not having complete documentation, there is some software support. For Arduino use, check out the Arduino ATECCx08 library. For Python and C/C++ check out Microchips Cryptoauthlib (yes we also think it's odd that there's no datasheet but there is published code)

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Features:

1. Crypto-authentication chip (Microchip ATECC608)
2. Secure key storage with challenge-response authentication
3. Supports cryptographic functions:
4. ECDH (Elliptic Curve Diffie-Hellman)
5. AES-128 encryption, decryption, and signing
6. SHA-256 and HMAC hashing
7. Hardware random number generation
8. I2C interface, fixed address 0x60
9. Recommended I2C speed: 400 kHz (for bus reliability)
10. Works with 3.3V or 5V logic and power
11. Breakout board with STEMMA QT / Qwiic connectors – no soldering needed
12. Compatible with: Arduino ATECCx08 library , Microchip CryptoAuthLib (Python, C/C++)
13. Based on proven ATECC508 architecture (ATECC608 is backward-compatible)

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Package Includes:

1 x Adafruit ATECC608 Breakout Board