Both ATSHA204 and ATECC108 are authentication devices. Authentication is the process of guaranteeing the identity of communicating parties and ensuring data integrity. Each chip uses a different approach to authentication. The ATECC108 device uses elliptical curve cryptography to provide the Elliptical Curve Digital Signature Algorithm (ECDSA). The ATSHA024 device uses a hash algorithm, SHA-256, to provide Hash Based Message Authentication Codes (HMAC).
Note
These two devices are not used in this book, but you can download the software from https://github.com/cryptotronix/hashlet and https://github.com/cryptotronix/eclet and see the example usage for ATSHA204 and ATECC108 respectively.
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