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@zooko It’s not impossible. It possible. Just take time. 50% chance to find a collision with 2^256 tries. 100% with 2^512.
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@zooko And so, if A is 10× faster than B, X% are reached 10× faster with A function than B…
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@zooko And so (again), if both functions are safe (no known weak/backdoor/attack), B is far better than A.
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