Hacking Secret Ciphers with Python

Chapter 11 – Encrypting and Decrypting Files 153

ENCRYPTING AND DECRYPTING

FILES

Topics Covered In This Chapter:
 Reading and writing files
 The open() function
 The read() file object method
 The close() file object method
 The write() file object method
 The os.path.exists() function
 The startswith() string method
 The title() string method
 The time module and time.time() function

“Why do security police grab people and torture them? To get their

information. If you build an information management system that

concentrates information from dozens of people, you’ve made that

dozens of times more attractive. You’ve focused the repressive regime’s

attention on the hard disk. And hard disks put up no resistance to torture.

You need to give the hard disk a way to resist. That’s cryptography.”