Codebreaking: A Beginner's Guide to Cryptanalysis (Paperback)

If you liked Dan Brown's Da Vinci Code--or want to solve similarly baffling cyphers yourself--this is the book for you!

A thrilling exploration of history's most vexing codes and ciphers that uses hands-on exercises to teach you the most popular historical encryption schemes and techniques for breaking them.

Solve history's most hidden secrets alongside expert codebreakers Elonka Dunin and Klaus Schmeh, as they guide you through the world of encrypted texts. With a focus on cracking real-world document encryptions--including some crime-based coded mysteries that remain unsolved--you'll be introduced to the free computer software that professional cryptographers use, helping you build your skills with state-of-the art tools. You'll also be inspired by thrilling success stories, like how the first three parts of Kryptos were broken.

Each chapter introduces you to a specific cryptanalysis technique, and presents factual examples of text encrypted using that scheme--from modern postcards to 19-century newspaper ads, war-time telegrams, notes smuggled into prisons, and even entire books written in code. Along the way, you'll work on NSA-developed challenges, detect and break a Caesar cipher, crack an encrypted journal from the movie The Prestige, and much more.

You'll learn:

• How to crack simple substitution, polyalphabetic, and transposition ciphers
• How to use free online cryptanalysis software, like CrypTool 2, to aid your analysis
• How to identify clues and patterns to figure out what encryption scheme is being used
• How to encrypt your own emails and secret messages

Codebreaking is the most up-to-date resource on cryptanalysis published since World War II--essential for modern forensic codebreakers, and designed to help amateurs unlock some of history's greatest mysteries.

如果你喜歡丹·布朗的《達文西密碼》──或者想要自己解開類似令人困惑的密碼──這本書就是為你而寫！這是一本關於歷史上最棘手的密碼和密碼技術的激動人心的探索，通過實踐練習教你最受歡迎的歷史加密方案和破解技術。

在專業密碼破解專家埃隆卡·杜寧和克勞斯·施梅的指導下，解開歷史上最隱秘的秘密，一起探索加密文本的世界。本書重點介紹破解現實世界文件加密的方法，包括一些尚未解決的基於犯罪的密碼謎題，並介紹專業密碼學家使用的免費計算機軟件，幫助你使用最先進的工具提升技能。同時，你還將被激勵於一些令人興奮的成功故事，例如《Kryptos》的前三部分是如何被破解的。

每一章介紹一種特定的密碼分析技術，並提供使用該方案加密的文本的實際例子──從現代明信片到19世紀的報紙廣告，戰時電報，偷運到監獄的筆記，甚至整本書都是密碼寫成的。在此過程中，你將解決美國國家安全局開發的挑戰，檢測並破解凱撒密碼，解開電影《頂尖對決》中的加密日記，以及更多。

你將學到：
- 如何破解簡單的替換、多表替換和置換密碼
- 如何使用免費的在線密碼分析軟件，如CrypTool 2，來幫助你的分析
- 如何識別線索和模式，以找出使用的加密方案
- 如何加密你自己的電子郵件和秘密信息

《密碼破解》是自第二次世界大戰以來發表的最新密碼分析資源──對於現代法醫密碼破解者至關重要，並旨在幫助業餘愛好者解開歷史上最偉大的謎題。

Elonka Dunin is an experienced crypto expert and maintains a list of the world's most famous unsolved codes on her elonka.com website. Bestselling author Dan Brown even named one of the characters in his Da Vinci Code sequel, The Lost Symbol, after her: "Nola Kaye" is a scrambled form of "Elonka." She is co-founder and co-leader of a group of cryptographers who are working hard to crack the final cipher on the famous Kryptos sculpture at CIA Headquarters, and in 2021 she was invited to give the TEDx talk "2,000 Years of Ordinary Secrets."

Klaus Schmeh is the most-published cryptology author in the world. He has written 15 books (in German) about the subject, as well as over 200 articles, 25 scientific papers, and 1,500 blog posts. He is a member of the editorial board of the scientific magazine, Cryptologia. Schmeh's main fields of interest are codebreaking and the history of encryption. His blog Cipherbrain is read by crypto enthusiasts all over the world. Schmeh is a popular speaker, known for his entertaining presentation style involving self-drawn cartoons and LEGO(R) models.

Elonka Dunin是一位經驗豐富的加密專家，並在她的elonka.com網站上維護著世界上最著名的未解密密碼列表。暢銷作家丹·布朗甚至在他的《達文西密碼》續集《失落的象徵》中以她的名字命名了一個角色：“Nola Kaye”是“Elonka”的一個混淆形式。她是一個由密碼學家組成的團隊的聯合創始人和聯合領導者，該團隊正在努力破解中央情報局總部著名的Kryptos雕塑上的最後一個密碼。2021年，她應邀發表了TEDx演講《2000年的普通秘密》。

Klaus Schmeh是世界上發表最多的密碼學作家。他已經寫了15本（德文）關於這個主題的書，還有200多篇文章、25篇科學論文和1500篇博客文章。他是科學雜誌《Cryptologia》的編輯委員會成員。Schmeh的主要興趣領域是密碼破解和加密歷史。他的博客Cipherbrain被全球的加密愛好者所閱讀。Schmeh是一位受歡迎的演講者，以他有趣的演講風格和自繪卡通和樂高模型而聞名。