"As gripping as a good thriller." --The Washington Post Unpack the science of secrecy and discover the methods behind cryptography--the encoding and decoding of information--in this clear and easy-to-understand young adult adaptation of the national bestseller that's perfect for this age of WikiLeaks, the Sony hack, and other events that reveal the extent to which our technology is never quite as secure as we want to believe. Coders and codebreakers alike will be fascinated by history's most mesmerizing stories of intrigue and cunning--from Julius Caesar and his Caeser cipher to the Allies' use of the Enigma machine to decode German messages during World War II. Accessible, compelling, and timely, The Code Book is sure to make readers see the past--and the future--in a whole new way. "Singh's power of explaining complex ideas is as dazzling as ever." --The Guardian

This illustrated encyclopedia surveys the history and development of code-making and code-breaking in all areas of culture and society from hieroglyphs and runes to DNA, the Zodiac Killer, graffiti, and beyond.

The classic guide to how computers work, updated with new chapters and interactive graphics "For me, Code was a revelation. It was the first book about programming that spoke to me. It started with a story, and it built up, layer by layer, analogy by analogy, until I understood not just the Code, but the System. Code is a book that is as much about Systems Thinking and abstractions as it is about code and programming. Code teaches us how many unseen layers there are between the computer systems that we as users look at every day and the magical silicon rocks that we infused with lightning and taught to think." - Scott Hanselman, Partner Program Director, Microsoft, and host of Hanselminutes Computers are everywhere, most obviously in our laptops and smartphones, but also our cars, televisions, microwave ovens, alarm clocks, robot vacuum cleaners, and other smart appliances. Have you ever wondered what goes on inside these devices to make our lives easier but occasionally more infuriating? For more than 20 years, readers have delighted in Charles Petzold's illuminating story of the secret inner life of computers, and now he has revised it for this new age of computing. Cleverly illustrated and easy to understand, this is the book that cracks the mystery. You'll discover what flashlights, black cats, seesaws, and the ride of Paul Revere can teach you about computing, and how human ingenuity and our compulsion to communicate have shaped every electronic device we use. This new expanded edition explores more deeply the bit-by-bit and gate-by-gate construction of the heart of every smart device, the central processing unit that combines the simplest of basic operations to perform the most complex of feats. Petzold's companion website, CodeHiddenLanguage.com, uses animated graphics of key circuits in the book to make computers even easier to comprehend. In addition to substantially revised and updated content, new chapters include: Chapter 18: Let's Build a Clock! Chapter 21: The Arithmetic Logic Unit Chapter 22: Registers and Busses Chapter 23: CPU Control Signals Chapter 24: Jumps, Loops, and Calls Chapter 28: The World Brain From the simple ticking of clocks to the worldwide hum of the internet, Code reveals the essence of the digital revolution.

Explains how different ciphers work, why they were invented, and how they were cracked, covering codes ranging from ancient Egyptian hieroglyphs and World War II's Enigma machines to the samurai code of honor.

From the internationally bestselling author Ezra Barany comes this award-winning Jewish version of The Da Vinci Code. A reclusive computer programmer Nathan Yirmorshy pounds out ones and zeros in the quiet of his home while his landlord secretly watches behind a two-way mirror. When an intercepted note connects the landlord to a secret society, and a detective ends up dead, Nathan must abandon his home and everything familiar to him, open his heart to a tarot reader he has never met, and trust her with his life-just as the ancient scriptures have foretold.

Explains various methods used in cryptography and presents examples to help readers in breaking secret codes

A brief look at various codes used through history to send and receive secret messages.

J Richard Knapp's best selling fictional story, Book of Codes, is the first great adventure of Sam (Samantha) and her twin brother, Nick. Follow the twins as they experience an elaborate action adventure filled with secret codes, people who are not what they appear to be, endless humor, and a discovery beyond their imagination - a secret hidden from the world for over 100 years! Reviews Teacher - "Once again J Richard Knapp grabs the attention of his readers! I read "Book of Codes" to my 5th graders and they begged me not to stop each day! Each day they would try to predict what would happen next, then be surprised by what actually did! Sam and Nick are characters that kids can relate to easily. Adults can too!" United Kingdom - "A really fun kids book, with codes to crack spread through the book. The two main characters are really likeable. I think the book is great for kids age around 12." Age 10 - "The thrill ride of the century!" Age 10 - "Best book ever!" Age 10 - "A great adventure!"

This illustrated encyclopedia surveys the history and development of code-making and code-breaking in all areas of culture and society from hieroglyphs and runes to DNA, the Zodiac Killer, graffiti, and beyond.