Started by Debarghya DasSep 25, 2021

Open
Is it possible generate a rainbow table knowing 2/3 of the string will always be the same?

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I have a 30 character string going into an MD5 generator. I know the first 20 characters are always the same and the last 10 are the ones im providing to the program.

Now the program will aways strcmp the result of the MD5 to a pregiven hash. For example:

base_string: aaaaaaaaaaaaaaaaaaaa
user_input: bbbbbbbbbb
result: aaaaaaaaaaaaaaaaaaaabbbbbbbbbb

hash = MD5(result)
strcmp(hash, expected_hash)

Is it possible to actually create a rainbow table from this information or reverse expected_hash in any way? Knowing that I can clearly see hash and expected_hash values using ltrace.

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made with by Abhishek & Priyanka Jalan