Hacking Secret Ciphers with Python

138 http://inventwithpython.com/hacking

Email questions to the author: [email protected]

PROGRAMMING A PROGRAM TO

TEST OUR PROGRAM

Topics Covered In This Chapter:
 The random.seed() function
 The random.randint() function
 List references
 The copy.deepcopy() Functions
 The random.shuffle() function
 Randomly scrambling a string
 The sys.exit() function

“It is poor civic hygiene to install technologies that

could someday facilitate a police state.”

Bruce Schneier, cryptographer

We can try out the transposition encryption and decryption programs from the previous chapter
by encrypting and decrypting a few messages with different keys. It seems to work pretty well.
But does it always work?