mnemonic backup of seed and deterministic generation for sub keys (if you ever support them) HD Wallet style
How do you feel about padding? Are you going to round up to a 64KB chunk? I feel bad about leaking the exact size of the payload. Plenty of embarrassing content someone might share is finger-printable, and there are CRIME like attacks if a third-party can influence the content.
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Isn’t padding to a chunk size easily defeated by straddling the boundary between +/- a chunk? This feels out of scope.
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That's only relevant to CRIME-like attacks, but even there padding is still very effective because it increases the number of trials you need to even find the boundary, and then only leaks 1 bit of information at that boundary.
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Nearest power of n.
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