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

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

What are codes for and who uses them? How do you make a code, how do you break a code? If you think only spies and soldiers use codes, you're wrong! Find out ho

"As gripping as a good thriller." --The Washington Post Unpack the science of secrecy and discover the methods behind cryptography--the encoding and decoding of

Learn how to program in Python while making and breaking ciphers—algorithms used to create and send secret messages! After a crash course in Python programmin