Cracking Simple Image Codes Using Python

[Th3_M4d_H4tt3r]

here is the code,

Code: Select all

from PIL import Image
import sys
import time

img = Image.open(sys.argv[1])
img = img.convert("RGB")

pixdata = img.load()

a = 0.2 * 255

for y in xrange(img.size[1]):
   for x in xrange(img.size[0]):
      print "Bruteforcing pixel "+str(x)+", "+str(y)+"   "
      print "\033[2A"

      pixel = pixdata[x, y]
      lumin = pixel[0] * 0.299 + pixel[1] * 0.587 + pixel[2] * 0.114

      if lumin < a:
         pixdata[x, y] = (0, 0, 0)
      else:
              pixdata[x, y] = (255, 255, 255)

print "Done bruteforce, opening image..."
print "Finished in "+str(time.clock())

img.show()


the image I cracked with this is:

[pretentious]

Nice. It's been a while since i've looked into this stuff. Is the next step to seperate each indervidual character?

[Th3_M4d_H4tt3r]

yes, I am working on that now i also updated the code; over 20x faster.

[pretentious]

I've had your code on my HDD just waiting to be played with. Here's something completely different i put together

Code: Select all

from PIL import Image
import sys
import time

img = Image.open(sys.argv[1])
tiles = int(sys.argv[2])
img = img.convert("RGB")

pixdata = img.load()

for y in range(0, img.size[1], (img.size[1]/tiles)):
   for x in range(0, img.size[0], (img.size[0]/tiles)):
      #print x, y
      red = 0
      green = 0
      blue = 0
      cells = 0
      for yi in range(y, (y+(img.size[1]/tiles)),1):
         for xi in range(x, (x+(img.size[0]/tiles)),1):
            cells = cells + 1
            pixel = pixdata[xi, yi]
            red = red + pixel[0]
            green = green + pixel[1]
            blue = blue + pixel[2]
      for yi in range(y, (y+(img.size[1]/tiles))):
         for xi in range(x, (x+(img.size[0]/tiles))):
                  pixdata[xi, yi] = (red/cells,green/cells,blue/cells)
img.show()


I'm in love with pythons simple API's. This takes an image and effectively pixelates it. I wanted to achive a proper bluring effect by making the squares bleed into each other but had other stuff to do. Anyone want to pick up where i left off?