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Thread: Rijndael S-Box? AES... Maybe even XOR? -- Examples

  1. #1
    ph3wl
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    Rijndael S-Box? AES... Maybe even XOR? -- Examples

    Hey guys, I have been working on this for a while now and though it couldn't hurt to post and see what you thought. I would say I'm a little on the obsessed side right now haha

    Old Borland c++ app that encrypts a txt file. I have been inside and out of this code I see everything that is happening I guess experience is failing me here. I have patched the encrypter exe to bypass for now but I'm not happy with that as an answer :/

    I think its Rijndael S-Box, couple peid crypt plugins have shown the locations of the tables

    Test Encryptions (Seems like no matter what is entered its padded to 16bytes)
    a =
    Code:
    [~Ÿ}$T
    no characters (empty file) =
    Code:
    —‘RP55Q
    this text is greater than sixteen characters =
    Code:
    QTž’˜x1t9D™D**'‚Vb1w…G(
    strings I have found in the exe and dll files that do the encryption/decryption
    Code:
    ku3V%4Z5ud8Fcbm! (this one shows up in olly at the method call, looks like it gets broken)
    Code:
    B4!wp0!w
    Code:
    a1c3e5g7i9k0m2o4q6s8u0w1y2789876 (I am seeing this one only in encrypting exe's hmm)
    found some new strings in a diff exe
    Name:  out.jpg
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    Update
    Found another exe which exposes a lot more info

    From what I can tell this is RijndaelDecrypt from Crypto++
    The key passed is a1c3e5g7i9k0m2o4q6s8u0w1y2789876

    also looks like on encrypt "enc" is added and decrypt "dec" is added to something

    I have a lot more to go off now...
    Last edited by ph3wl; February 21st, 2011 at 16:15. Reason: New possible key found
    I promise that I have read the FAQ and tried to use the Search to answer my question.

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