Section 3
Machines
Wiring the substitution into hardware.
5 entries in Machines
The whole register →- Wiring it into metalRotors turn the substitution at every keystroke, so the alphabet never repeats within any practical message.
- The steppingHow the wheels advance, and why the irregularity matters.
- The reflectorA design decision that made the machine reciprocal — and gave away that no letter could ever encipher to itself.
- Operator habitPredictable openings, reused settings and lazy indicators did more damage than any mathematical weakness.
- Keeping a machine secretThe system was published; the settings were the secret. Mostly.