Posts tagged with “cryptography”

Using ATECC508A Cryptographic co-processor with ESP32

Using ATECC508A Cryptographic co-processor with ESP32

Time to tackle the ATECC508A crypto chip! I started building an ESP32 component library to use it in my FIDO2 Authenticator. One chip gave me trouble, but another worked perfectly. Lots of I2C fun, ECC signatures, and some helpful inspiration from SparkFun’s Arduino library. One step closer to full hardware-based security.

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WebAuthN - authentication without password

WebAuthN - authentication without password

Ever heard of logging in without passwords? I stumbled upon the FIDO2/WebAuthn standard and it’s actually pretty cool—just your fingerprint and you’re in. I looked into how it works, its pros, and some open questions that still bug me (like… what if you lose the device?). Check it out!

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