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transpositionEncrypt.py
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transpositionEncrypt.py
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# Transposition Cipher Encryption
# https://www.nostarch.com/crackingcodes (BSD Licensed)
import pyperclip
def main():
myMessage = '''Augusta Ada King-Noel, Countess of Lovelace (10 December 1815 - 27 November 1852) was an English mathematician and writer, chiefly known for her work on Charles Babbage's early mechanical general-purpose computer, the Analytical Engine. Her notes on the engine include what is recognised as the first algorithm intended to be carried out by a machine. As a result, she is often regarded as the first computer programmer.'''
myKey = 13
ciphertext = encryptMessage(myKey, myMessage)
# Print the encrypted string in ciphertext to the screen, with
# a | ("pipe" character) after it in case there are spaces at
# the end of the encrypted message.
print(ciphertext + '|')
# Copy the encrypted string in ciphertext to the clipboard.
pyperclip.copy(ciphertext)
def encryptMessage(key, message):
# Each string in ciphertext represents a column in the grid.
ciphertext = [''] * key
# Loop through each column in ciphertext.
for column in range(key):
currentIndex = column
# Keep looping until currentIndex goes past the message length.
while currentIndex < len(message):
# Place the character at currentIndex in message at the
# end of the current column in the ciphertext list.
ciphertext[column] += message[currentIndex]
# move currentIndex over
currentIndex += key
# Convert the ciphertext list into a single string value and return it.
return ''.join(ciphertext)
# If transpositionEncrypt.py is run (instead of imported as a module) call
# the main() function.
if __name__ == '__main__':
main()