false 2468720 158089 29608 0684831309 9780684831305 4 http://photo.goodreads.com/books/1168034461m/29608.jpg http://photo.goodreads.com/books/1168034461s/29608.jpg http://www.goodreads.com/book/show/29608.The_Codebreakers_The_Comprehensive_History_of_Secret_Communication_from_Ancient_Times_to_the_Internet 4.22 58 The Codebreakers focuses on the 20th century, especially World War II. But its reach is long. Kahn traces cryptology's origins to the advent of writing. It seems that as soon as people learned how to record their thoughts, they tried to figure out ways of keeping them hidden. Kahn covers everything from the theory of ciphering to the search for "messages" from outer space. He concludes with a few thoughts about encryption on the Internet. ]]> 16679 3.95 91 12 1973 0 0 false Wed Jun 27 19:53:08 -0700 2007 Wed Jun 27 19:54:44 -0700 2007 more...]]>