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Comment by ouid | Hacker News Reader

What dows generating preimages mean here? The preimage is the set of all messages that hash to some set of hashes. Is the author saying the the hash function is reversible in reasonable time?

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It's a buffer overflow. They can get a vulnerable implementation to execute arbitrary code, so they can get it to return any value they want. The actual SHA-3 algorithm wouldn't return the same value as the vulnerable implementation, of course.

I didn't see anybody mention arbitrary code execution

It's in the post:

    a specially constructed file can result in arbitrary code execution

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