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If we have a file and its hash, can we recreate a hashing al

 
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VORP
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PostPosted: Thu Dec 08, 2022 7:40 am    Post subject: If we have a file and its hash, can we recreate a hashing al Reply with quote

If I have a file and its hash, can I recreate hashing algorithm that was used for this file? I have multiple files (about 7) and I have their hashes. Can I use them to recreate their hashing method? Is there a created tool for this?
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ParkourPenguin
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PostPosted: Thu Dec 08, 2022 12:43 pm    Post subject: Reply with quote

You can't reverse a hash into the file it was created from. That's literally the main point of hashing algorithms.

You can batch apply a lot of hashing algorithms onto a file and compare them against the valid hash to find the hashing algorithm. I don't know of any tools to do that automatically (TBF I haven't looked)

If everything is local, you can debug a process that verifies the hash and reverse engineer your way to the hashing algorithm. Of course this would require a lot of knowledge of both assembly and hashing algorithms.

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