Strange Encryption (Help!)

Discussion in 'Software' started by 3D-Reality, Dec 24, 2004.

  1. 3D-Reality

    3D-Reality Private E-2

    My friend has set me this 'test' of my skills and provided a test string and sample strings:


    Test String - a6cb53c20131f38bfecc8df72b2b09b29da18335acb7

    a - b4
    aa - b4fd
    aaa - b4fd2f
    aaaa - b4fd2fdc

    b - b7
    bb - b751
    bbb - b75195
    bbbb - b7519569

    c - b6
    cc - b641
    ccc - b64164
    cccc - b641644c

    d - b1
    dd - b176
    ddd - b176a3
    dddd - b176a32d

    abcd - b4fe49f9
    dcba - b171cc4e
    abba - b171cc4e
    baab - b752b940

    Please help me work out how this encryption works so I can decode the sample string!

    Thanks
    John
     
    3D-Reality, Dec 24, 2004
    #1
  2. 3D-Reality

    3D-Reality Private E-2

    P.S. I have so far worked out that the first block of hex is produced by this:

    (Ascii Value of Letter XOR 213)
     
    3D-Reality, Dec 24, 2004
    #2
  3. 3D-Reality

    3D-Reality Private E-2

    While trying to work this out I asked my friend why ABBA and DCBA were the same - apparently ABBA was wrong and I should ignore it.
     
    3D-Reality, Dec 24, 2004
    #3

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