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Exploded view of an Enigma rotor. The Enigma was a small, portable electro-mechanical rotor machine used to encrypt and decrypt secret messages. Key: (1) notched ring; (2) marking dot for "A" contact; (3) alphabet tyre; (4) plate contacts; (5) wire connections; (6) pin contacts; (7) spring-loaded ring adjusting lever; (8) hub; (9) finger wheel; (10) ratchet. Illustration credit: Eric Pierce |
