Schlüsselgerät 41

The Schlüsselgerät 41, or "Key Device 41," was an encryption device used by the German military during World War II. It was primarily employed for secure communications within the Wehrmacht and other branches of the German armed forces. The device was designed to encrypt and decrypt messages, making it difficult for enemy forces to intercept and understand the communications. The Schlüsselgerät 41 was notable for its use of a system of wheels and mechanical components to generate ciphers.