The Code Book: The Secrets Behind Codebreaking

<b>As gripping as a good thriller. --<i>The Washington Post</i><br><br>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.</b><br><br>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.<br><br>Accessible compelling and timely <i>The Code Book</i> is sure to make readers see the past--and the future--in a whole new way.<br><br>Singh's power of explaining complex ideas is as dazzling as ever. --<i>The Guardian</i> “Singh utilizes an effective narrative style and intersperses fascinating events and people.”–<i>School Library Journal</i> <b>Simon Singh</b> is the bestselling author of <i>Fermat’s Enigma</i> <i>The Code Book</i><i> Big Bang</i><i> Trick or Treatment?: Alternative Medicine on Trial</i><i> </i>and <i>The Simpsons and Their Mathematical Secrets</i>. He lives in London. 1<br><br>The Cipher of Mary Queen of Scots<br><br>The birth of cryptography the substitution cipher and the invention of codebreaking by frequency analysis<br><br>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.<br><br>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.<br><br>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.<br><br>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.<br><br>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.<br><br>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. <b>As gripping as a good thriller. --<i>The Washington Post</i><br><br>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.</b><br><br>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.<br><br>Accessible compelling and timely <i>The Code Book</i> is sure to make readers see the past--and the future--in a whole new way.<br><br>Singh's power of explaining complex ideas is as dazzling as ever. --<i>The Guardian</i>