I'm learning about client puzzles for DoS (Denial of Services) Protection, and I came across this question.

Client puzzle protocol implementation, how we can implement puzzle with HMAC functionality?

Referencing Client Puzzles and HMAC question I want to ask, every time 0 only we need to put as validation or what server generates with HMAC that last byte we need to validate? The scheme which is explained there is only pointing to 0 in the last of the hash, why not any other digit?

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    If you "came across" this question, I presume that it was asked as an exercise. What have you tried and where are you stuck? Are you sure of the "or" in the middle of the sentence? Shouldn't that be colon? – Maarten Bodewes Nov 22 at 13:30

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