import random

def encrVigenere(key, msg):

# Vigenere Cipher (Polyalphabetic Substitution Cipher)

# https://www.nostarch.com/crackingcodes/ (BSD Licensed)

LETTERS = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'

def encryptMessage(key, message):

return translateMessage(key, message, 'encrypt')

def decryptMessage(key, message):

return translateMessage(key, message, 'decrypt')

def translateMessage(key, message, mode):

translated = [] # Stores the encrypted/decrypted message string.

keyIndex = 0

key = key.upper()

for symbol in message: # Loop through each symbol in message.

num = LETTERS.find(symbol.upper())

if num != -1: # -1 means symbol.upper() was not found in LETTERS.

if mode == 'encrypt':

num += LETTERS.find(key[keyIndex]) # Add if encrypting.

elif mode == 'decrypt':

num -= LETTERS.find(key[keyIndex]) # Subtract if decrypting.

num %= len(LETTERS) # Handle any wraparound.

# Add the encrypted/decrypted symbol to the end of translated:

if symbol.isupper():

translated.append(LETTERS[num])

elif symbol.islower():

translated.append(LETTERS[num].lower())

keyIndex += 1 # Move to the next letter in the key.

if keyIndex == len(key):

keyIndex = 0

else:

# Append the symbol without encrypting/decrypting:

translated.append(symbol)

return ''.join(translated)

return translateMessage(key, msg, 'encrypt')

def genRandomText(length):

seq = []

sym = list(r'1234567890-=\][poiuytrewqasdfghjkl;/.,mnbvcxz!@#$~`%^&*()_+|}{POIUYTREWQASDFGHJKL:"?><MNBVCXZ"}')

for i in range(length):

seq.append(random.choice(sym))

return ''.join(seq)

msg = input('Enter message to send > ')

key = input('Enter key > ')

emailtext = encrVigenere(key, msg) + '''

Go to http://decrypt.prajwalagrawal.repl.run to decrypt''' +'''

''' + genRandomText(random.randint(0, 10001)) + '| ' + key + ' |' + genRandomText(random.randint(0, 10001))

fpath = input('Please enter the file path where the text file will be saved. For example: "C:\\Users\\[username]\\Documents > ')

f = open(fpath + '\\ciphertext.txt', 'w+')

f.write(emailtext)

f.close()

print(r'The ciphertext and key have been copied to a text file called ciphertext.txt located in '+ fpath + r'\ciphertext.txt' + '. You can copy/paste the text into an email, or just keep it on your computer.')