def decryptMsg(self, newCipher, keybv, totalCipherBlock):
decryptedpt = BitVector(size=0)
for i in range(0, totalCipherBlock):
msg = newCipher[i * self.BLOCKSIZE:(i + 1) *
self.BLOCKSIZE] ^ keybv
decryptedpt += msg
return decryptedpt.get_bitvector_in_ascii()
def decode(self, image_path):
"""
Attempts to decode message hidden in the image at given path
:param image_path: Path to image
:return: Hidden message string
"""
image = Image.open(image_path)
image_rgb = image.convert("RGB")
bit_string = ""
width, height = image.size
for j in range(height):
for i in range(
width
): # Collect message bits until NULL terminator is reached
(red, green, blue) = image_rgb.getpixel((i, j))
if len(bit_string
) >= 16 and bit_string[-16:] == "0000000000000000":
break
else:
bit_string += bin(red)[-2:]
if len(bit_string
) >= 16 and bit_string[-16:] == "0000000000000000":
break
else:
bit_string += bin(green)[-2:]
if len(bit_string
) >= 16 and bit_string[-16:] == "0000000000000000":
break
else:
bit_string += bin(blue)[-2:]
else: # If inner loop breaks, break out of outer loop
continue
break
message_bit_vector = BitVector(bitstring=bit_string)
return message_bit_vector.get_bitvector_in_ascii()
sample_cipher = []
key = None
bv = BitVector(filename="sample_ciphertext.txt")
#
while (bv.more_to_read):
sample_cipher.append(bv.read_bits_from_file(64))
print("\t** Possible Keys **")
for k in rows:
k = BitVector(bitstring=k[0])
print k.get_bitvector_in_ascii()
DES(BitVector(bitstring=k), "sample_plaintext.txt", "test_cipher.txt")
if IsCipherEqual(sample_cipher):
key = k
conn.close()
file_out = open("key.txt", "w")
key.write_to_file(file_out)
message_file = 'target_ciphertext.txt'
decrypted_file = 'decrypted.txt'
decrypt = True
if decrypt:
DES(key, message_file, decrypted_file, reverse=True)
fr = open('decrypted.txt', 'r')
