"Discusses different methods for breaking secret codes"--Provided by publisher.

Ever since humans first began to communicate, we’ve had secrets to keep — secrets of state, war, business, or the heart. From the moment the first secret me

"Discusses different methods for speaking secret codes"--Provided by publisher.

This unique book explains the basic issues of classical and modern cryptography, and provides a self contained essential mathematical background in number theor

Covert communications have won or lost wars, exposed political intrigue, disguised secret religions and societies, and secured financial transactions. This imme