Caeser-Cipher-Python/ccipher.py at master · arunravilla/Caeser-Cipher-Python · GitHub

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# Caesar Cipher Encryption and Decryption
def encryptMessage(message, key):
	message = message
	message = message.upper()
	key = key
	letters = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
	letterslen = len(letters)
	translated = ""
	for m in message:
		if m in letters:
			myval = letters.find(m)
			myval = myval+key

			if myval >= letterslen:
				myval = myval-letterslen
			elif myval < 0:
				myval = myval+letterslen
			translated = translated + letters[myval]
		else:
			translated = translated + m
	return translated

def decryptMessage(message, key):
	message = message
	message = message.upper()
	key = key
	letters = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
	letterslen = len(letters)
	translated = ""
	for m in message:
		if m in letters:
			myval = letters.find(m)
			myval = myval-key

			if myval >= letterslen:
				myval = myval-letterslen
			elif myval < 0:
				myval = myval+letterslen
			translated = translated + letters[myval]
		else:
			translated = translated + m
	return translated