InCTF 2014 - Stegnography 400
Give an image, the flag is hidden in the Blue plane. import os,sys import Image modi_bin = Image.open("modi.png").convert('RGB') bin = '' R = open('r.txt','w') G = open('g.txt','w') B = open('b.txt','w') # By Analysing the text docs I found blue Plane First column is embedded with data flag = '' flag1 = '' for h in range(modi_bin.size[1]): # Fetches Height count = 0 binR = '' binG = '' binB = '' for w in range(modi_bin.size[0]): # Fetches Width count += 1 binR += str(modi_bin.getpixel((w,h))[0] & 1) binG += str(modi_bin.getpixel((w,h))[1] & 1) binB += str(modi_bin.getpixel((w,h))[2] & 1) if w == 0: # blue plane first bit flag += str(modi_bin.getpixel((w,h))[2] & 1) if count == 8: R.write(binR) G.write(binG) B.write(binB) binR=' ';binG=' ';binB=' ' count = 0 R.write(binR+'\n') G.