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Simple Substitution Cipher Algorithm (Python recipe) by Captain DeadBones
ActiveState Code (http://code.activestate.com/recipes/578544/)

This script was written for an article I wrote It converts any plain text into a Caesar Cipher message. For more information Caesar Ciphers In Python

Python, 20 lines
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import sys

def main(argv):
	if (len(sys.argv) != 2):
		sys.exit('Usage: sub.py <k>')
		
	plaintext = list(raw_input('Enter message: '))
	alphabet = list('abcdefghijklmnopqrstuvwxyz')
	k = int(sys.argv[1])
	cipher = ''
		
	for c in plaintext:
		if c in alphabet:
			cipher += alphabet[(alphabet.index(c)+k)%(len(alphabet))]
		
	print 'Your encrypted message is: ' + cipher
	

if __name__ == "__main__":
	main(sys.argv[1:])
Tags: cipher, encryption, python