def main():
random.seed(50) #set random seed to static value
# Generate 20 random test
for i in range(20):
# Genereate random message to test
# Message will have random length (betwewen 4 and 40)
message = 'ABCDEFGHIJKLMNOPQRSTUVWYXZ' * random.randint(4,40)
#Convert the message string to a list to shuffle it:
message = list(message)
random.shuffle(message)
#Convert list back to string
message = ''.join(message)
print('Test #%s: "%s..."' % (i + 1, message[:50]))
# check all possible keys for each message
for key in range (1, int(len(message)/2)):
encrypted = transpositionEncrypt.encryptMessage(key, message)
decrypted = decryptTransposition.decryptMessage(key, encrypted)
# If the decryption doesn't match the original message, display an error message and quit
if message != decrypted:
print('There is something wrong with the key %s and message %s' % (key,message))
print('Decrypted as: ' + decrypted)
sys.exit()
print('Transposition cipher test passed')
def hackTransposition(message):
print 'Hacking...'
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 = decryptTransposition.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
#accounts for false positives
print 'Enter D for done, or just press Enter to continue hacking:'
response = raw_input('> ')
if response.strip().upper().startswith('D'):
return decryptedText
return None
def main():
#inputFilename = 'frankenstein.txt'
# to decrypt, next line must run
inputFilename = 'frankenstein.encrypted.txt'
outputFilename = 'frankenstein.decrypted.txt'
myKey = 10
myMode = 'decrypt'
# if input file does not exist program leaves early.
if not os.path.exists(inputFilename):
print "the file %s does not exist. Qutting..." % (inputFilename)
sys.exit()
# if output file exists, give user a chance to continue
if os.path.exists(outputFilename):
print "this will overwrite the file %s. (C)ontinue or (Q)uit?" % (outputFilename)
response = raw_input('> ')
if not response.lower().startswith('c'):
sys.exit()
# read in message from input file
fileObj = open(inputFilename)
content = fileObj.read()
fileObj.close()
print '%sing...' % (myMode.title()) # converts lowercase to first letter capitalized
startTime = time.time()
if myMode == 'encrypt':
translated = TranspositionCipher.encryptMessage(myKey, content)
elif myMode == 'decrypt':
translated = decryptTransposition.decryptMessage(myKey, content)
totalTime = round(time.time() - startTime, 2)
print '%sion time: %s seconds' % (myMode.title(), totalTime)
# write out translated message to a file
outputFileObj = open(outputFilename, 'w')
outputFileObj.write(translated)
outputFileObj.close()
print 'Done %sing %s (%s characters).' % (myMode, inputFilename, len(content))
print '%sed file is %s.' % (myMode.title(), outputFilename)
def main():
fileName = 'helloworld.txt'
outputFileName = 'encryptedFile.txt'
myKey = 10
encryptMode = 'encrypt'
if not os.path.exists(fileName):
print('The file %s does not exist.' % (fileName))
sys.exit()
# If output file already exist the user can quit or continue to encrypt new file
if os.path.exists(fileName):
print('This will overwrite the file %s. (C)ontinue or (Quit)' %
(outputFileName))
response = input('> ')
# if response does not start with c exit the system
if not response.lower().startswith('c'):
sys.exit()
# Read the message from the input file
fileObj = open(fileName)
content = fileObj.read()
fileObj.close()
print('%sing...' % (encryptMode.title()))
# Measure how long the encryption and decryption takes
startTime = time.time()
if encryptMode == 'encrypt':
translated = transpositionEncrypt.encryptMessage(myKey, content)
elif encryptMode == 'decrypt':
translated = decryptTransposition.decryptMessage(myKey, content)
totalTime = round(time.time() - startTime, 2)
print('%sion time:%s seconds' % (encryptMode.title(), totalTime))
# Write the translated message to the textfile
outputFileObj = open(outputFileName, 'w')
outputFileObj.write(translated)
outputFileObj.close()
print('Done %sing %s (%s characters).' %
(encryptMode, fileName, len(content)))
print('%sed file is %s.' % (encryptMode.title(), fileName))
