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"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
"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
En raison de restrictions imposées par l'éditeur, la bibliothèque n'est pas en mesure d'acheter des exemplaires supplémentaires de ce titre et nous vous présentons toutes nos excuses si la liste d'attente est longue. N'oubliez pas de regarder s'il existe d'autres exemplaires, car d'autres éditions sont peut-être disponibles.
En raison de restrictions imposées par l'éditeur, la bibliothèque n'est pas en mesure d'acheter des exemplaires supplémentaires de ce titre et nous vous présentons toutes nos excuses si la liste d'attente est longue. N'oubliez pas de regarder s'il existe d'autres exemplaires, car d'autres éditions sont peut-être disponibles.
Extraits-
Chapter One
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...
Au sujet de l’auteur-
Simon Singh is the bestselling author of Fermat’s Enigma, The Code Book, Big Bang, Trick or Treatment?: Alternative Medicine on Trial,and The Simpsons and Their Mathematical Secrets. He lives in London.
Critiques-
March 1, 2002 Simon Singh breaks down cryptic messages for the teenage set in The Code Book: How to Make It, Break It, Hack It, Crack It, an adaptation of his bestselling adult title The Code Book: The Science of Secrecy from Ancient Egypt to Quantum Cryptology. He covers actual instances of codebreaking, from its role in the plan to execute Mary, Queen of Scots, to the Navajo code talkers of WWII.
Starred review from August 30, 1999 In an enthralling tour de force of popular explication, Singh, author of the bestselling Fermat's Enigma, explores the impact of cryptography--the creation and cracking of coded messages--on history and society. Some of his examples are familiar, notably the Allies' decryption of the Nazis' Enigma machine during WWII; less well-known is the crucial role of Queen Elizabeth's code breakers in deciphering Mary, Queen of Scots' incriminating missives to her fellow conspirators plotting to assassinate Elizabeth, which led to Mary's beheading in 1587. Singh celebrates a group of unsung heroes of WWII, the Navajo "code talkers," Native American Marine radio operators who, using a coded version of their native language, played a vital role in defeating the Japanese in the Pacific. He also elucidates the intimate links between codes or ciphers and the development of the telegraph, radio, computers and the Internet. As he ranges from Julius Caesar's secret military writing to coded diplomatic messages in feuding Renaissance Italy city-states, from the decipherment of the Rosetta Stone to the ingenuity of modern security experts battling cyber-criminals and cyber-terrorists, Singh clarifies the techniques and tricks of code makers and code breakers alike. He lightens the sometimes technical load with photos, political cartoons, charts, code grids and reproductions of historic documents. He closes with a fascinating look at cryptanalysts' planned and futuristic tools, including the "one-time pad," a seemingly unbreakable form of encryption. In Singh's expert hands, cryptography decodes as an awe-inspiring and mind-expanding story of scientific breakthrough and high drama. Agent, Patrick Walsh. (Oct.) FYI: The book includes a "Cipher Challenge," offering a $15,000 reward to the first person to crack that code.
School Library Journal
"Singh utilizes an effective narrative style and intersperses fascinating events and people."
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