def fixed_xor(hex_value_1, hex_value_2):
byte_array_1 = hex_to_byte_array(hex_value_1)
byte_array_2 = hex_to_byte_array(hex_value_2)
xor_byte_array = [byte_1 ^ byte_2 for (byte_1, byte_2) in zip(byte_array_1, byte_array_2)]
return byte_array_to_hex(xor_byte_array)
def break_single_byte_xor_cipher(hexed):
text = hex_to_byte_array(hexed)
possible_keys = range(256)
scores = { candidate: score(decrypt_single_byte_xor_cipher(candidate, text))
for candidate in possible_keys }
key = max(scores, key=scores.get)
return decrypt_single_byte_xor_cipher(key, text)
