Cracking Codes with Python: An Introduction to Building and Breaking Ciphers

Al Sweigart

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商品描述

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!

商品描述(中文翻譯)

學習如何使用Python編程,同時製作和破解密碼——這些算法用於創建和發送秘密信息!在簡短的Python編程基礎課程之後,您將學習製作、測試和破解使用傳統密碼(如置換密碼和維吉尼亞密碼)對文本進行加密的程序。您將從簡單的反向和凱撒密碼程序開始,然後逐步深入到公鑰加密,這是用於保護當今在線交易(包括數字簽名、電子郵件和比特幣)的加密類型。

每個程序都包含完整的代碼和逐行解釋。通過閱讀本書,您將學會如何使用Python編程,並且您將擁有一些聰明的程序來證明這一點!

您還將學習以下內容:
- 將循環、變量和流程控制語句結合到真正的工作程序中
- 使用字典文件立即檢測解密的消息是否為有效的英文或胡言亂語
- 創建測試程序以確保您的代碼正確加密和解密
- 編寫(和破解!)使用模數運算加密消息的仿射密碼的工作示例
- 使用蛮力和頻率分析等技術破解密碼

沒有比玩真實程序更好的學習編程的方法了。《使用Python破解密碼》讓學習變得有趣!