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CRACKING CODES

WITH PYTHON

CRACKING CODES

WITH PYTHON

AN INTRODUCTION TO

BUILDING AND BREAKING CIPHERS

AL SWEIGART

SECRET CIPHERS

BY HACKING

LEARN PYTHON

SECRET CIPHERS

BY HACKING

LEARN PYTHON

Learn how to program in Python while making and

breaking ciphers—algorithms used to create and send

secret messages!

After a crash course in Python programming basics,

you’ll learn to make, test, and hack programs that

encrypt text with classical ciphers like the transposition

cipher and Vigenère cipher. You’ll begin with simple

programs for the reverse and Caesar ciphers and then

work your way up to public key cryptography, the type

of encryption used to secure today’s online transactions,

including digital signatures, email, and Bitcoin.

Each program includes the full code and a line-by-line

explanation of how things work. By the end of the book,

you’ll have learned how to code in Python and you’ll

have the clever programs to prove it!

You’ll also learn how to:

• Combine loops, variables, and flow control

statements into real working programs

• Use dictionary files to instantly detect whether

decrypted messages are valid English or gibberish

• Create test programs to make sure that your code

encrypts and decrypts correctly

• Code (and hack!) a working example of the affine

cipher, which uses modular arithmetic to encrypt a

message

• Break ciphers with techniques such as brute-force and

frequency analysis

There’s no better way to learn to code than to play with

real programs. Cracking Codes with Python makes the

learning fun!

ABOUT THE AUTHOR

Al Sweigart is a professional software developer

who teaches programming to kids and adults. He is

the author of Automate the Boring Stuff with Python,

Invent Your Own Computer Games with Python,

and Scratch Programming Playground, also from

No Starch Press. His programming tutorials can

be found at inventwithpython.com.

www.nostarch.com

THE FINE ST IN GEEK E NTERTAINMENT

™

“I L IE FL AT.”

This book uses a durable binding that won’t sna p shut.

FSC FPO

SHELVE IN: PROGRAMMING

LANGUAGES/PYTHON

$29.95 ($39.95 CDN)

COVERS

PYTHON 3

CRACKING CODES WITH PYTHON

SWEIGART

Some rights reserved. This work is licensed under the Creative Commons Attribution-NonCommercial-

ShareAlike 3.0 United States License. To view a copy of this license, visit http://creativecommons.org/licenses/

by-nc-sa/3.0/us/ or send a letter to Creative Commons, PO Box 1866, Mountain View, CA 94042, USA.

ISBN-10: 1-59327-822-5

ISBN-13: 978-1-59327-822-9

Publisher: William Pollock

Production Editor: Riley Hoffman

Cover Illustration: Josh Ellingson

Interior Design: Octopod Studios

Developmental Editors: Jan Cash and Annie Choi

Technical Reviewers: Ari Lacenski and Jean-Philippe Aumasson

Copyeditor: Anne Marie Walker

Compositors: Riley Hoffman and Meg Sneeringer

Proofreader: Paula L. Fleming

For information on distribution, translations, or bulk sales,

please contact No Starch Press, Inc. directly:

No Starch Press, Inc.

245 8th Street, San Francisco, CA 94103

phone: 1.415.863.9900; info@nostarch.com

www.nostarch.com

Library of Congress Cataloging-in-Publication Data

Names: Sweigart, Al, author.

Title: Cracking codes with Python : an introduction to building and breaking

ciphers / Al Sweigart.

Description: San Francisco : No Starch Press,Inc., [2018]

Identifiers: LCCN 2017035704 (print) | LCCN 2017047589 (ebook) | ISBN

9781593278694 (epub) | ISBN 1593278691 (epub) | ISBN 9781593278229 (pbk.)

| ISBN 1593278225 (pbk.)

Subjects: LCSH: Data encryption (Computer science) | Python (Computer program

language) | Computer security. | Hacking.

Classification: LCC QA76.9.A25 (ebook) | LCC QA76.9.A25 S9317 2018 (print) |

DDC 005.8/7--dc23

LC record available at https://lccn.loc.gov/2017035704

No Starch Press and the No Starch Press logo are registered trademarks of No Starch Press, Inc. Other

product and company names mentioned herein may be the trademarks of their respective owners. Rather

than use a trademark symbol with every occurrence of a trademarked name, we are using the names only

in an editorial fashion and to the benefit of the trademark owner, with no intention of infringement of the

trademark.

The information in this book is distributed on an “As Is” basis, without warranty. While every precaution

has been taken in the preparation of this work, neither the author nor No Starch Press, Inc. shall have any

liability to any person or entity with respect to any loss or damage caused or alleged to be caused directly or

indirectly by the information contained in it.

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