Code Making, Code Breaking: Band 15/Emerald

ISBN-13: 9780007336449 / Miękka / 2011 / 48 str.

Richard Platt

Opis

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 how codes have been used throughout history, from ancient Egypt through to the Cold War.