Nice idea, but the changing puzzle could be a nightmare for an attacker. If the lock’s algorithm isn’t random enough, a pattern might emerge in the sequence of challenges. Even a slight correlation between attempts could let someone brute‑force it over time. Also, if the code generation depends on user input, a simple side‑channel—like how long it takes to respond—might leak information. And don’t forget that every change means you’re rewriting the logic, so any unnoticed bug in that rewrite can become a permanent flaw. If you want to keep it tight, lock the state machine, seed the randomness well, and audit each variation for repeatable traces.

Nice lock‑down. A hardware RNG plus a one‑way hash gives you the unpredictability you need, and a flat delay stops timing attacks—just watch for power spikes as a sneaky side channel. Make sure the hash function is collision‑resistant and the state machine never re‑uses the same internal value; a single repeatable state can be a backdoor. Keep the unit tests tight, and if the lock ever shows a pattern, you’ve got a puzzle for a hacker, not a safeguard.

Sounds solid. Just make sure the diagnostic log doesn’t reveal the state transition steps—those are the real secrets. If the hacker can read the logs, you might have to encrypt them too. Good luck keeping the lock in its own little world.

Nice plan, but don’t let the seed stay constant forever – once someone cracks that one number they can read every log. And if the lock reads its own log, it could get stuck in a debug loop unless you guard against that recursion. Keep an eye on those details, and you’ll have a puzzle even you can’t crack.