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³ ûirogen's Super-Duper Encryption Cracker ³  [û] FDA Approved
³ ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ ³  [û] FCC Class B Appliance
³   version 2.0; (c)1995 ûirogen [NuKE]    ³  [û] Love Me, Fuck Me, Kill Me
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 Hello boys and girls of America and beyond, and welcome to my latest
 endeavor into the performing art of coding. This software simply
 cracks encryption using any of the following techniques:

   8-bit ADD and SUB     16-bit ADD
   8-bit XOR             16-bit XOR
   8-bit ROR and ROL     16-bit ROR and ROL
   8-bit NOT             16-bit NOT

 Which means you can now easily decrypt the majority of computer viruses
 out there and see what text is inside without having to ever touch a
 disassemble. Not to mention the fact that there are LOTS of software
 which uses these encryption algorithms for its internal or external
 encryption purposes.


 How to Use:
 ************************************************************
 The command line syntax is:
  VIROCRK [filename] [text]

  [filename] is the file you're wishing to crack. It should not exceed
             62k
  [text] is a few bytes which you think will be contained in a decrypted
         copy of the file. This parameter is case sensitive. The more
         plaintext you can come up with, the fewer false positives will
         arise.

 Examples:
  VIROCRK HELLO.COM COM
  VIROCRK ALPHA.TXT THE
  VIROCRK IVB.NTZ COM
  VIROCRK HELPME.EXE LA LA PA LOO ZA

 While VIROCRK is running, hit a key to abort. The exit may not be
 immediate.


 Output From VIROCRK
 ************************************************************
 When a successful decryption occurs, VIROCRK writes the decrypted
 file to a DEC-XXXX.??? filename. The last 4 bytes of this filename,
 and the extension indicate key and decryption technique used.

  DEC-XXXX.??? :

 XXXX- Key between 0 and FFFF. This is, ofcourse, hexadecimal.

 ???- 8XR = 8-bit XOR
      8SB = 8-bit SUB
      8RT = 8-bit ROR
      16X = 16-bit XOR
      16S = 16-bit SUB
      16R = 16-bit ROR



 History
 ************************************************************
 v1.0 - Initial Release
 v1.1 - I changed something
 v2.0 - þ Improved speed significantly by now attempting to encrypt
          the plaintext with each possible key rather than decrypt
          the ciphertext with key. Note that since I switched to this
          faster method, the plaintext sequence should be greater than
          three bytes or you'll have many false positives after adjusting
          the 16-bit addressing.
        þ No longer attempts address-adjusted 16-bit XOR; no point in this.
          The byte-reversed key should have been successful in the
          non-adjusted 16-bit XOR.


                                        later..
                                         ûirogen/NuKE