Hacking Secret Ciphers with Python

Chapter 17 – The Simple Substitution Cipher 235

THE SIMPLE SUBSTITUTION

CIPHER

Topics Covered In This Chapter:
 The sort() list method
 Getting rid of duplicate characters from a string
 The isupper() and islower() string methods
 Wrapper functions

“In my role as Wikileaks editor, I've been involved

in fighting off many legal attacks. To do that, and

keep our sources safe, we have had to spread

assets, encrypt everything, and move

telecommunications and people around the world

to activate protective laws in different national

jurisdictions.”

Julian Assange, editor-in-chief of Wikileaks