During the Second World War, the German military communicated via a supposedly unbreakable cryptographic device: the Enigma machine. Looking like an oversized typewriter, it scrambled plain text into gibberish using a series of rotating electromechanical wheels. Because the rotors moved after every single keystroke, the machine could generate nearly 159 quintillion possible settings. The German high command believed that this astronomical number made brute-force decryption physically impossible. They were correct. However, they underestimated the brilliant mathematical minds at Britain's Bletchley Park, led by Alan Turing. Instead of guessing every combination, the codebreakers identified human behavioral flaws-like operators repeatedly using the same predictable phrases or failing to randomize their starting positions-to dramatically narrow down the mathematical possibilities. This book breaks down the sheer mechanical genius of both the encryption and the decryption. You will explore the wiring of the Enigma rotors, the invention of the "Bombe" machines that automated the codebreaking process, and the birth of modern computer science. Decode the greatest intellectual triumph of the twentieth century. Learn how logic, mathematics, and early electromechanical engineering defeated the ultimate Nazi cryptographic weapon.

Author