def challenge_3():
hex_string = "1b37373331363f78151b7f2b783431333d78397828372d363c78373e783a393b3736"
cipher_bytes = crypto.hex_to_bytes(hex_string)
candidate_bytes = [[byte] for byte in range(0, 255)]
result = crypto.brute_single_xor(cipher_bytes, candidate_bytes)
print("Plaintext: %s" % result[1])
def challenge_4():
input_file = "1-4.txt"
candidate_bytes = [[byte] for byte in range(0, 255)]
best_result = (None, None, 0)
for line in open(input_file).readlines():
line = line.strip()
if not line:
continue
cipher_bytes = crypto.hex_to_bytes(line)
result = crypto.brute_single_xor(cipher_bytes, candidate_bytes)
if result[1] and result[2] > best_result[2]:
best_result = result
print("Plaintext: %s" % best_result[1])