Codes and their subsequent encryption methods have been the underbreath of communication since the dawn of civilization. In all their forms, be it the dense language of the Navajo once used by the American military or the 128-bit encryptions of modern security software, they all aim to protect the information they deliver. This updated edition of The Codebreakers, the classic history of codes and ciphers-tells how they work, how they are broken, and the roles they have played in war and peace-has also been expanded to include a new final chapter on computer security issues. | The Codebreakers by David Kahn, Hardcover | Indigo Chapters