def main():
random.seed(42) # set the random "seed" to a static value
for i in range(20): # run 20 tests
# Generate random messages to test.
# The message will have a random length
message = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ' * random.randint(4, 40)
# Convert the message string to a list to shuffle it.
message = list(message)
random.shuffle(message)
message = ''.join(message) # Convert list to string
print('Test #%s: "%s..."' % (i + 1, message[:50]))
# Check all possible keys for each message.
for key in range(1, len(message)):
encrypted = transEncrypt.encryptMessage(key, message)
decrypted = transDecrypt.decryptMessage(key, encrypted)
# If message and decrypted don't match, display an error message
# and quit.
if message != decrypted:
print('Mismatch with key %s and message %s.' % (key, message))
print(decrypted)
sys.exit()
print('Transposition cipher test passed.')
def hackTransposition(message):
print('Hacking...')
# Python programs can be stopped at any time by pressing Ctrl-C (on Windows)
# or Ctrl-D (on Mac and Linux)
print('(Press Ctrl-C or Ctrl-D to quit at any time.)')
# brute-force by looping through every possible key
for key in range(1, len(message)):
print('Trying key #%s...' % (key))
decryptedText = transDecrypt.decryptMessage(key, message)
if detectEnglish.isEnglish(decryptedText):
# Check with user to see if the decrypted key has been found
print()
print('Possible encryption hack:')
print('Key %s: %s' % (key, decryptedText[:100]))
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
def main():
random.seed(42) # set the random "seed" to a static value
for i in range(20): # run 20 tests
# Generate random messages to test.
# The message will have a random length
message = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ' * random.randint(4,40)
# Convert the message string to a list to shuffle it.
message = list(message)
random.shuffle(message)
message = ''.join(message) # Convert list to string
print('Test #%s: "%s..."' % (i+1, message[:50]))
# Check all possible keys for each message.
for key in range(1, len(message)):
encrypted = transEncrypt.encryptMessage(key, message)
decrypted = transDecrypt.decryptMessage(key, encrypted)
# If message and decrypted don't match, display an error message
# and quit.
if message != decrypted:
print('Mismatch with key %s and message %s.' % (key, message))
print(decrypted)
sys.exit()
print('Transposition cipher test passed.')
def hackTransposition(message):
print('Hacking...')
# Python programs can be stopped at any time by pressing Ctrl-C (on Windows)
# or Ctrl-D (on Mac and Linux)
print('(Press Ctrl-C or Ctrl-D to quit at any time.)')
# brute-force by looping through every possible key
for key in range(1, len(message)):
print('Trying key #%s...' % (key))
decryptedText = transDecrypt.decryptMessage(key, message)
if detectEnglish.isEnglish(decryptedText):
# Check with user to see if the decrypted key has been found
print()
print('Possible encryption hack:')
print('Key %s: %s' % (key, decryptedText[:100]))
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
def main():
inputFilename = input('File name: ')
# Be careful. Tis will overwrite that file
myMode = input('Encrypt or decrypt: ')
myMode = myMode.lower()
myKey = int(input('Key: '))
# This sets the file name
if myMode == 'encrypt':
outputFilename = inputFilename[:len(inputFilename) - 4] + '.encrypted.txt'
if myMode == 'decrypt':
outputFilename = inputFilename[:len(inputFilename) - 4] + '.decrypted.txt'
# If the file does not exist, terminate early
if not os.path.exists(inputFilename):
print('The file %s does not exist. Quitting...' % (inputFilename))
sys.exit()
# If the output file already exists, give the user a chance to quit.
if os.path.exists(outputFilename):
print('This will overwrite the file %s. (C)ontinue or (Q)uit?' % (outputFilename))
response = input('> ')
if not response.lower().startswith('c'):
sys.exit()
# Read in the message from the input file
fileObj = open(inputFilename)
content = fileObj.read()
fileObj.close()
print('%sing...' % (myMode.title()))
# Measure how long it takes
startTime = time.time()
if myMode == 'encrypt':
translated = encryptMessage(myKey, content)
elif myMode == 'decrypt':
translated = decryptMessage(myKey, content)
totalTime = round(time.time() - startTime, 2)
print('%sion time: %s seconds' % (myMode.title(), totalTime))
# write out the translated message to the output file.
outputFileObj = open(outputFilename, 'w')
outputFileObj.write(translated)
outputFileObj.close()
outputFilename = outputFilename
print('Done %sing %s (%s characters).' % (myMode, inputFilename, len(content)))
