"It would be hard to imagine a clearer or more fascinating presentation. . . . Mr. Singh gives cryptography not only its historical dimension but its human one." —The New York Times

"Entertaining and satisfying. . . . Offers a fascinating glimpse into the mostly secret competition between codemakers and codebreakers."        –USA Today
  
"A good read that, bless it, makes the reader feel a bit smarter when it’s done. Singh’s an elegant writer and well-suited to the task of leading the mathematically perplexed through areas designed to be tricky."        –Seattle Weekly
  
"An absorbing tale of codemaking and codebreaking over the centuries." —Scientific American

"Singh spins tales of cryptic intrigue in every chapter." —The Wall Street Journal

"Brings together…the geniuses who have secured communications, saved lives, and influenced the fate of nations. A pleasure to read." —Chicago Tribune

"Enthralling…commendably lucid…[Singh’s] book provides a timely and entertaining summary of the subject." —The Economist