>>caust1+(OP)
I've always wanted to write a serverless OIDC provider/SAML IdP but got stymied by the WebAuthn standards, which don't seem to be written for normal people. :( But this e-book looks like it might have enough actual code interleaved with exposition to serve as more than just a high-level intro.
>>xenoph+A6
Adam Langley is probably one of the most gifted teachers when it comes to explaining cryptography concepts. Very clear, concise, precise, and makes it simple enough for me to follow without getting my neurons all knotted up.