Demystifying the Enigma Machine - a Functional Journey
summary
Explains a working Enigma simulator implemented in F#, mapping plugboard, three rotors and reflector to a pipeline of F# functions char->char with machine state threaded immutably and rotated on each keypress, reproducing the reflector symmetry and 159 quintillion theoretical keys; includes a React front end transpiled from F#, a brute force “bombe” that checks millions of configs in ~20 seconds for short cribs, and a test suite using unit tests and property-based testing (FSCheck) against real WWII messages.
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chapters (12)
- 0:00Introduction
- 2:11Enigma machine overview
- 8:36Bletchley Park role
- 13:52How Enigma worked
- 17:48Live Enigma demo
- 18:08Allies breaking Enigma
- 27:05F# and functional intro
- 32:05Why F# for Enigma
- 38:02Enigma code walkthrough
- 44:07Testing Enigma strategies
- 50:28Enigma’s lost legacy
- 53:20Modern security lessons and functional programming takeaways
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