Are You Having Trouble Reverse Engineering The Checksum Of A File?

October 2, 2021 By John Anthony Off

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Sometimes your system can generate an error code indicating the checksum of the reverse engineering file. This problem can be caused by a number of reasons.

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Not The Answer You Want? Look For Other Questions Marked With Security Hash Functions Or Ask Your Own Question.

This is actually one of our main attributes of cryptographic hash functions. As mentioned on the wiki, they are designed in such a way that they cannot be undone:

It is often impossible to generate a message from this hash value except by iterating over all possible messages

Additionally, a property indicating that a small change in a word results in a fully qualified output value is also a cryptographic hashing requirement:

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A recent post edit should change the hash value to such an extent that most of the new hash value does not correlate with the old hash value

The only way to do this is to try all the possibilities (which today is considered obviously impossible in training) or to find a loophole in some kind of hashing mechanism.

Today MD5 and SHA1 are not considered serviceable due to such errors (see here or)

However, there are actually caches or shared strings with different hash values, and some of the message values can be found on the Internet. https://crackstation.net/ is such a good repository with a lot of hash functions like

for the hash 0ba904eae8773b70c75333db4de2f3ac45a8ad4ddba1b242f0b3cfc199391dd8 you provided to find an example you might run into here.

answered Jun 16, 2017 at 15:40

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No, not right now. The most common operation involving hashing and checksums results in loss of information from the process. This means that you can have multiple files with the same hash and the same checksum. The only way to know that you have restored the original file is to comparewith it the original file.

answered Jun 19, 2017 at 17:55