num_pages: 419
description: Learn how to program in Python while making and breaking ciphersalgorithms used to create and send secret messages! After a crash course in Python programming basics youll learn to make test and hack programs that encrypt text with classical ciphers like the transposition cipher and Vigenre cipher. Youll 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 todays 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 youll have learned how to code in Python and youll have the clever programs to prove it!Youll also learn how - 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 analysisTheres no better way to learn to code than to play with real programs. Cracking Codes with Python makes the learning fun!
language: English
title: Cracking Codes with Python: An Introduction to Building and Breaking Ciphers
publisher: No Starch Press