false 7574959 527050 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 3 0 false Wed Aug 01 00:00:00 -0700 2007 Thu Oct 11 06:54:41 -0700 2007 Tue Oct 23 09:54:15 -0700 2007 more...]]>