Update for Virtual SG-41: the numeric-only SG-41z now available at https://sg41.virtualcolossus.co.uk
Used for sending weather reports where the details were encoded as a set of numbers. It's very similar to the SG-41 but with a few interesting omissions which I'll be documenting soon.
Work is progressing on the numeric only SG-41Z model of Virtual Schlüsselgerät 41 used for sending weather information. The print wheels were tricky but are done. I managed to get enough resolution from the Deutsches Museum's SG-41Z scan to see the numbers, but it would appear that at some point, the whole print wheel assembly has been fitted back in back to front as the numbers would be upside down and running the wrong way compared to the print roller. Another difference is the SG-41Z only has 5 of the sensing arms (6 on SG-41) and 15 bars on the cage (25 on SG-41) so that'll be the next task before it can encipher correctly.
I'm working on an update to Virtual SG-41. I want to also simulate the SG-41Z which was a numeric only version of the full one used for sending encoded weather reports. It uses a lot of the same mechanics, it'll be interesting to find out the differences.
https://sg41.virtualcolossus.co.uk
The Nazis' Most Notoriously Complex Cryptographic Machine Is Now Available Online
Explore the byzantine inner workings of... the Hitler Mill.
Virtual SG-41 project brings Nazi cipher machine to life in the browser
https://www.theregister.com/2026/04/08/virtual_sg41/
Virtual SG-41 project brings Nazi cipher machine to life in the browser
: Martin Gillow's 3D recreation lets users explore would-be Enigma successor's mechanics and enciphering logic online
10 Years of Virtual Colossus: 2026
And we're up to date and therefore, today is the release of my latest project: Virtual Schlüsselgerät 41
After a year of work try it out for yourself using just your web browser.
Hope you like my new website design too!
https://sg41.virtualcolossus.co.uk
Released today: Virtual Schlüsselgerät 41
This cipher machine, based on Hagelin C-38 but WAY more complex was set to replace Enigma.
Over a year of work & research & it's ready for you to try for yourself.
https://sg41.virtualcolossus.co.uk
@ccr
10 Years of Virtual Colossus: 2025
Did you know that Turing designed a valve computer using mercury delay lines as memory after the war? The pilot machine ran 75 years ago and was recreated as Virtual Pilot ACE this year. And we're up to date .. excited for release of Virtual SG-41 tomorrow! pilotace.virtualcolossus.co.uk
10 Years of Virtual Colossus: 2024
The next sim I worked on was the M-209, an American version of the Hagelin C-38. A new resource, the CT scans of the machines at @DeutschesMuseum, meant I could very accurately model each part giving amazing detail!
https://m209.virtualcolossus.co.uk
Android Enigma Simulator