some small fixes

Steganography/dec_image/color_crypto.py

@@ -0,0 +1,30 @@
+#!/usr/bin/env python
+
+from PIL import Image
+import random
+
+def get_color(x, y, r):
+	n = (pow(x, 3) + pow(y, 3)) ^ r
+	return (n ^ ((n >> 8) << 8 ))
+
+flag_img = Image.open("flag.png")
+im = flag_img.load()
+r = random.randint(1, pow(2, 256))
+print flag_img.size
+
+enc_img = Image.new(flag_img.mode, flag_img.size)
+enpix = enc_img.load()
+
+for x in range(flag_img.size[0]):
+	for y in range(flag_img.size[1]):
+		t = random.randint(1, pow(2, 256)) % 250
+		enpix[x,y] = t
+
+
+for x in range(flag_img.size[0]):
+	for y in range(flag_img.size[1]):
+		if im[x,y] < 250 :
+			s = get_color(x, y, r)
+			enpix[x,y] = s
+		
+enc_img.save('enc' + '.png')

Steganography/dec_image/color_crypto_dec.py

@@ -0,0 +1,38 @@
+#!/usr/bin/python
+
+from PIL import Image
+import random
+import operator
+
+def get_color(x, y, r):
+	n = (pow(x, 3) + pow(y, 3)) ^ r
+	return (n ^ ((n >> 8) << 8 ))
+
+flag_img = Image.open("flag.png")
+im = flag_img.load()
+print flag_img.size
+
+enc_img = Image.new(flag_img.mode, flag_img.size)
+enpix = enc_img.load()
+
+d = {}
+for i in range(0, 256):
+	d[i] = 0
+
+for x in range(flag_img.size[0]):
+	for y in range(flag_img.size[1]):
+		enpix[x,y] = 0
+		r = im[x, y] ^ ((pow(x, 3) + pow(y, 3)) % 256)
+		d[r] += 1
+
+use = max(d.iteritems(), key=operator.itemgetter(1))[0]
+
+for x in range(flag_img.size[0]):
+	for y in range(flag_img.size[1]):
+		r = im[x, y] ^ ((pow(x, 3) + pow(y, 3)) % 256)
+		if r == use:
+			enpix[x, y] = 255
+
+print use
+
+enc_img.save('dec' + '.png')

Steganography/xor_image_broken/xor_image.py

@@ -0,0 +1,17 @@
+from PIL import Image
+img = Image.open('steg100.png')
+
+strbit1 = ''
+for y in range(0, img.size[1], 19):
+	for x in range(0, img.size[0], 19):
+		r = img.getpixel((x, y))
+		strbit1 += str(r & 1)
+
+strbit2 = ''
+for y in range(171, 171 + 19):
+	for x in range(171, 171 + 19):
+		a = img.getpixel((x, y))
+		strbit2 += str(a & 1)
+
+xored = ''.join(str(int(A) ^ int(B)) for A, B in zip(strbit1, strbit2))
+print ''.join(chr(int(xored[i:i + 8], 2)) for i in range(0, len(xored), 8))

Steganography/xor_image_broken/xor_image.py~

@@ -0,0 +1,18 @@
+from PIL import Image
+img = Image.open('steg100.png')
+
+strbit1 = ''
+for y in range(0, img.size[1], 19):
+	for x in range(0, img.size[0], 19):
+		print img.getpixel((x, y))
+		print r
+		strbit1 += str(r & 1)
+
+strbit2 = ''
+for y in range(171, 171 + 19):
+	for x in range(171, 171 + 19):
+		a = img.getpixel((x, y))
+		strbit2 += str(a & 1)
+
+xored = ''.join(str(int(A) ^ int(B)) for A, B in zip(strbit1, strbit2))
+print ''.join(chr(int(xored[i:i + 8], 2)) for i in range(0, len(xored), 8))