def breakNull(ciphertext):
# The program needs to try keys of length 1 (such as '5'), of length 2 (such as '5 5'), and so on up to length MAX_KEY_LENGTH.
# This is because the key '1 0' will decrypt differently than '1 0 0'.
for trialKeyLength in range(1, MAX_KEY_LENGTH + 1):
# We will be using the "list of int values" for of keys. The string form like '4 2 3' that we use in the original encryption program is used just because it makes it easier to type for the user.
# We use list replication (multiplying a list value by an int value) to get the starting key.
trialKey = [0] * trialKeyLength
trialKey = getNextKey(trialKey)
while trialKey != [0] * trialKeyLength:
decryptedText = nullCipher.decryptMessage(ciphertext, trialKey)
percentEnglish = round(transpositionBreaker.getEnglishCount(decryptedText) * 100, 2)
if percentEnglish > 0:
print('Key %s decrypts to %s%% English.' % (trialKey, percentEnglish))
if percentEnglish >= 25:
print()
print('Possible encryption break:')
print('Key ' + str(trialKey) + ': ' + decryptedText[:100])
print()
print('Enter D for done, or just press Enter to continue breaking:')
response = input('> ')
if response.upper().startswith('D'):
return decryptedText
trialKey = getNextKey(trialKey)
print('No decryptions found. Code breaking has failed.')
return None
def hackNull(ciphertext):
# The program needs to try keys of length 1 (such as '5'), of length 2
# (such as '5 3'), and so on up to length MAX_KEY_DIGITS.
for keyLength in range(1, MAX_KEY_DIGITS + 1):
for keyParts in itertools.product(range(MAX_KEY_NUMBER + 1), repeat=keyLength):
key = []
for digit in keyParts:
key.append(str(digit))
key = ''.join(key)
decryptedText = nullCipher.decryptMessage(key, ciphertext)
if not SILENT_MODE:
print('Key %s: %s' % (key, decryptedText[:40]))
if detectEnglish.isEnglish(decryptedText):
print()
print('Possible encryption hack:')
print('Key: %s' % (key))
print('Decrypted message: ' + decryptedText[:200])
print()
print('Enter D for done, or just press Enter to continue hacking:')
response = input('> ')
if response.strip().upper().startswith('D'):
return decryptedText
return None # failed to hack encryption
def hackNull(ciphertext):
# The program needs to try keys of length 1 (such as '5'), of length 2
# (such as '5 3'), and so on up to length MAX_KEY_DIGITS.
for keyLength in range(1, MAX_KEY_DIGITS + 1):
for keyParts in itertools.product(range(MAX_KEY_NUMBER + 1),
repeat=keyLength):
key = []
for digit in keyParts:
key.append(str(digit))
key = ''.join(key)
decryptedText = nullCipher.decryptMessage(key, ciphertext)
if not SILENT_MODE:
print('Key %s: %s' % (key, decryptedText[:40]))
if detectEnglish.isEnglish(decryptedText):
print()
print('Possible encryption hack:')
print('Key: %s' % (key))
print('Decrypted message: ' + decryptedText[:200])
print()
print(
'Enter D for done, or just press Enter to continue hacking:'
)
response = input('> ')
if response.strip().upper().startswith('D'):
return decryptedText
return None # failed to hack encryption
