Observed arrival · 2026-09-29
Enigma — The machine and its history
An interactive lesson uses a 3D Enigma machine to explain its history, settings, and electrical mechanics.
○Open
⊠Login
$Paid
†Ads
✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- Learners exploring Enigma and wartime cryptography
- Worth noticing
- The lesson notes that daily key sheets used water-soluble ink and were not allowed on planes.
Field notes
The lesson describes the message's return journey through the machine and includes controls for rotor letters, plugboard connections, and ring settings. Its historical details connect those mechanics to operating procedures: daily sheets specified settings, and their water-soluble ink and air-travel restriction helped protect them. The page also notes that naval operators had a larger rotor selection than Army and Air Force operators.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
ƒJavaScriptBrowser-side code central
One card from the complete issue