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.

• IntroductionChapter 1: Making Paper Cryptography ToolsChapter 2: Installing PythonChapter 3: The Interactive ShellChapter 4: Strings and Writing ProgramsChapter 5: The Reverse CipherChapter 6: The Caesar CipherChapter 7: Hacking the Caesar Cipher with the Brute-Force TechniqueChapter 8: Encrypting with the Transposition CipherChapter 9: Decrypting with the Transposition CipherChapter 10: Programming a Program to Test Our ProgramChapter 11: Encrypting and Decrypting FilesChapter 12: Detecting English ProgrammaticallyChapter 13: Hacking the Transposition CipherChapter 14: Making a Modular Arithmetic Module for the Multiplicative and Affine CiphersChapter 15: Programming the Affine CipherChapter 16: Hacking the Affine CipherChapter 17: The Simple Substitution CipherChapter 18: Hacking the Simple Substitution CipherChapter 19: The Vigenere CipherChapter 20: Frequency AnalysisChapter 21: Hacking the Viginere CipherChapter 22: The One-Time Pad CipherChapter 23: Finding Prime NumbersChapter 24: Generating Keys for the RSA CipherChapter 25: Public Key Cryptography and Programming the RSA CipherAppendix: Debugger

“Definitely worth the read even as an experienced Python developer. I learned more about cryptography and even a few new Python tricks.”—Ray Doyle, The Ethical Hacker Network“I recommend this book for anyone who wants to learn Python/programming and is interested in security or puzzles.”—Jeanne Boyarsky, Code Ranch“A fantastic programming and cryptography course for any high school-aged child.”—The Old Schoolhouse Magazine