Reverse Code Engineering RCE CD +sandman 2000/ReverseCodeEngineeringRceCdsandman2000.iso/RCE/E_bliss/bullet80.txt

Text File | 2000-05-25 | 2KB | 33 lines

Greetings...

  I just, out of boredom, solved BuLLeT's Crackme 8.0

  First of all, the only tools you'll need is a hexadecimal calculator, a
  HEX-DEC converter (CCONVERT comes in handy after all :), and a
  brain...I'm sure that there is a way to do this using Soft-ICE, but I
  did it without---I discovered the algo by luck (sort of)...Okay I saw
  that you needed to type a serial into the first dialouge box and then a
  Registration number will appear, and it needs to match the one
  shown...So basically, it takes the value you put into the serial number
  box, does some manipulations with it, and if after the manipulations it
  matches the reg. number, your serial is valid :)  So just to experiment,
  I typed a '0' into the serial box, and clicked on the 'Spider' button.
  The registration number was 0. With a 1 for serial, the reg number was
  3. With a 2, it was 6. With a 3 it was 9 (I think your starting to
  notice the pattern here). With a 4, it was C...Wait a second, that's not
  a decimal character! I typed a hex number into the serial box (123CA4)
  and it said "Not a valid integer!" This told me that you must enter a
  Decimal number, it will be manipulated then converted to hex---So since
  I knew the generation routine (Increment by 3 for each decimal
  increment), I pulled out my Hexadecimal calculator, and divided the
  given reg. number that your serial when manipulated needs to equal, and
  divided it by three. I got a Hex value...So I went into my base
  converter, typed that number into the hex box, and then typed the
  Decimal value given into the Serial box in the crackme....And voila, job
  done :) (If you don't have a base converter, use the calculator that
  comes with windows 95/98 I think)

  This was a fast job and may not be very well written/easy to understand
  --- If so, sorry

Craftie