hackingciphers.pdf

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Hacking Secret
Ciphers with Python
By Al Sweigart
Copyright © 2013 by Al Sweigart
Some Rights Reserved. “Hacking Secret Ciphers with Python” is licensed under a Creative
Commons Attribution-Noncommercial-Share Alike 3.0 United States License.
You are free:
To Share — to copy, distribute, display, and perform the work
To Remix — to make derivative works
Under the following conditions:
Attribution — You must attribute the work in the manner specified by the author or
licensor (but not in any way that suggests that they endorse you or your use of the work).
(Visibly include the title and author's name in any excerpts of this work.)
Noncommercial — You may not use this work for commercial purposes.
Share Alike — If you alter, transform, or build upon this work, you may distribute
the resulting work only under the same or similar license to this one.
This summary is located here: http://creativecommons.org/licenses/by-nc-sa/3.0/us/ Your fair use and other rights are
in no way affected by the above. There is a human-readable summary of the Legal Code (the full license), located here:
http://creativecommons.org/licenses/by-nc-sa/3.0/us/legalcode
Book Version 3
Special thanks to Ari Lacenski. I can’t thank her enough. Without her efforts there’d be typos literally on every page.
Thanks to Jason Kibbe. Cover lock photo by “walknboston” http://www.flickr.com/photos/walkn/3859852351/ Romeo
& Juliet and other public domain texts from Project Gutenberg. Various image resources from Wikipedia. Wrinkled
paper texture by Pink Sherbet Photography http://www.flickr.com/photos/pinksherbet/2978651767/ Computer User
icon by Katzenbaer.
If you've downloaded this book from a torrent, it’s probably out of date. Go
to http://inventwithpython.com/hacking to download the latest version.
ISBN 978-1482614374
1st Edition
Nedroid Picture Diary by Anthony Clark, http://nedroid.com
Movies and TV shows always make hacking look exciting with furious typing and meaningless
ones and zeros flying across the screen. They make hacking look like something that you have to
be super smart to learn. They make hacking look like magic.
It’s not magic. It’s based on computers, and everything computers do have logical
principles behind them which can be learned and understood.
Even when you don’t
understand or when the computer does something frustrating or mysterious, there is always,
always, always a reason why.
And it’s not hard to learn. This book assumes you know nothing about cryptography or
programming, and helps you learn, step by step, how to write programs that can hack encrypted
messages. Good luck and have fun!
100% of the profits from this book are donated
to the Electronic Frontier Foundation, the Creative Commons, and the Tor Project.
Dedicated to Aaron Swartz, 1986 – 2013
“Aaron was part of an army of citizens that believes democracy
only works when the citizenry are informed, when we know about
our rights—and our obligations. An army that believes we must
make justice and knowledge available to all—not just the well born
or those that have grabbed the reins of power—so that we may
govern ourselves more wisely.
When I see our army, I see Aaron Swartz and my heart is broken.
We have truly lost one of our better angels.”
- C.M.

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