The Code Book for Young People: How to Make It, Break It, Hack It, Crack It

Singh, Simon

ISBN 10: 0385900325 ISBN 13: 9780385900324

Publisher: Delacorte Books for Young Readers, 2002

Synopsis

It’s known as the science of secrecy. Cryptography: the encoding and decoding of private information. And it is history’s most fascinating story of intrigue and cunning. From Julius Caesar and his Caesar Cipher to the code used by Mary Queen of Scots and her conspiracy to the use of the Engima machine during the Second World War, Simon Singh follows the evolution of secret writing.

Accessible, compelling, and timely, this international bestseller, now adapted for young people, is sure to make readers see the past—and the future—in a whole new way.


From the Hardcover edition.

About this title

About the Author

Simon Singh is the author of Fermat’s Enigma and The Code Book. He lives in London.


From the Hardcover edition.

From the Back Cover

“Singh utilizes an effective narrative style and intersperses fascinating events and people.”–School Library Journal


From the Trade Paperback edition.

Reviews

Grade 7 Up-An in-depth look at the use of secret codes throughout history. Singh utilizes an effective narrative style and intersperses fascinating events and people in this abridged version of his adult book of the same title (Doubleday, 1999). The text, illustrations, charts, and tables are the same. A few chapters have been omitted here, yet the overall flow of the book remains smooth. The difference between steganography and cryptography is discussed, as are the two forms of cryptography: transposition and substitution. A detailed history of secret codes is provided, from Herodotus's earliest accounts of secret messages to Arab cryptographers, Mary Queen of Scots, the German Enigma machine, and the Navajo code talkers. Current work on secret codes and their importance in today's society of Internet commerce are discussed. The last chapter, "The Codebreaker's Challenge," consists of four cryptograms. No solutions are given, but the methods to solve them are discussed. Unfortunately, the glossary from the original title is missing in this version. This book will be a popular addition to any YA collection, especially where secret codes and spy books are popular.
Shauna Yusko, King County Library System, Bellevue, WA
Copyright 2002 Reed Business Information, Inc.

Excerpt. © Reprinted by permission. All rights reserved.

1

The Cipher of Mary Queen of Scots

The birth of cryptography, the substitution cipher and the invention of codebreaking by frequency analysis

On the morning of Saturday, October 15, 1586, Queen Mary entered the crowded courtroom at Fotheringhay Castle. Years of imprisonment and the onset of rheumatism had taken their toll, yet she remained dignified, composed and indisputably regal. Assisted by her physician, she made her way past the judges, officials and spectators, and approached the throne that stood halfway along the long, narrow chamber. Mary had assumed that the throne was a gesture of respect toward her, but she was mistaken. The throne symbolized the absent Queen Elizabeth, Mary's enemy and prosecutor. Mary was gently guided away from the throne and toward the opposite side of the room, to the defendant's seat, a crimson velvet chair.

Mary Queen of Scots was on trial for treason. She had been accused of plotting to assassinate Queen Elizabeth in order to take the English crown for herself. Sir Francis Walsingham, Elizabeth's principal secretary, had already arrested the other conspirators, extracted confessions and executed them. Now he planned to prove that Mary was at the heart of the plot, and was therefore equally to blame and equally deserving of death.

Walsingham knew that before he could have Mary executed, he would have to convince Queen Elizabeth of her guilt. Although Elizabeth despised Mary, she had several reasons for being reluctant to see her put to death. First, Mary was a Scottish queen, and many questioned whether an English court had the authority to execute a foreign head of state. Second, executing Mary might establish an awkward precedent--if the state is allowed to kill one queen, then perhaps rebels might have fewer reservations about killing another, namely, Elizabeth. Third, Elizabeth and Mary were cousins, and their blood tie made Elizabeth all the more squeamish about ordering her execution. In short, Elizabeth would sanction Mary's execution only if Walsingham could prove beyond any hint of doubt that she had been part of the assassination plot.

The conspirators were a group of young English Catholic noblemen intent on removing Elizabeth, a Protestant, and replacing her with Mary, a fellow Catholic. It was apparent to the court that Mary was a figurehead for the conspirators, but it was not clear that she had given her blessing to the conspiracy. In fact, Mary had authorized the plot. The challenge for Walsingham was to demonstrate a clear link between Mary and the plotters.

On the morning of her trial, Mary sat alone in the dock, dressed in sorrowful black velvet. In cases of treason, the accused was forbidden counsel and was not permitted to call witnesses. Mary was not even allowed secretaries to help her prepare her case. However, her plight was not hopeless, because she had been careful to ensure that all her correspondence with the conspirators had been written in cipher. The cipher turned her words into a meaningless series of symbols, and Mary believed that even if Walsingham had captured the letters, he could have no idea of the meaning of the words within them. If their contents were a mystery, then the letters could not be used as evidence against her. However, this all depended on the assumption that her cipher had not been broken.

Unfortunately for Mary, Walsingham was not merely principal secretary, but also England's spymaster. He had intercepted Mary's letters to the plotters, and he knew exactly who might be capable of deciphering them. Thomas Phelippes was the nation's foremost expert on breaking codes, and for years he had been deciphering the messages of those who plotted against Queen Elizabeth, thereby providing the evidence needed to condemn them. If he could decipher the incriminating letters between Mary and the conspirators, then her death would be inevitable. On the other hand, if Mary's cipher was strong enough to conceal her secrets, then there was a chance that she might survive. Not for the first time, a life hung on the strength of a cipher.


From the Hardcover edition.

Edition details

• Publisher: Delacorte Books for Young Readers
• Publication date: 2002
• Language: English
• ISBN 10: 0385900325
• ISBN 13: 9780385900324
• Binding: Library Binding
• Number of pages: 272