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Is it significantly easier to reverse a sha256 hash if you know that the input was a 32 byte output of sha256? Assuming a random N-bit input ($N>3256$) versus a 256-bit input, for all practical intents and purposes, the difficultly is extremely difficult (read: not feasible by today's computational capabilities) for both. If you are talking about a ...


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Is it significantly easier to reverse a sha256 hash if you know that the input was a 32 byte output of sha256? It depends on what you are comparing to. Is it easier to reverse an SHA-256 hash of some SHA-256 hash than that of a random number? Sure, it can be. For example, it is easy to find that the preimage of ...


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Answer No, that would not be possible. It would be very weird indeed if a hash was suddenly invertible if the input was of a specific form - it would basically mean that the hash would be broken. Iterating over all the possible values of those 32 bytes is certainly not an option either. Peculiarities That does not mean that such a structure doesn't have ...



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