Bücher von David Kahn

Explains how to neutralize an opponent; useful footwork, positioning, and manoeuvres; and self-defence principles for women. This guide helps you to overcome your opponent and keep yourself safe.

He introduces key figures on both sides of the battle including: Arthur Scherbius, who gave the Germans a boost in the race between codemaker and codebreaker and Polish mathematician Marian Rejewski, who reconstructed the Enigma keys.