Welcome to this simulation of a German Lorenz SZ40/42.
Switch on the Lorenz by clicking the power button above
Look around by left-clicking and dragging on the background. Right-click (or shift-click) will move the camera and middle-mouse will zoom. Alternatively, you can use the Change View buttons below to move to
pre-set camera positions.
Click and drag on any of the 12 rotor thumbwheels to change the start position. Click on the lock below the rotors to open/close the cover to change the settings on the rotors. Click on any of the small switches to toggle them on/off.
The large red switch at the base switches between Aus/Off (no encipherment) and Ein/On (encipher) modes.
Press the keys on the teleprinter to send messages or type on your keyboard. To switch to figures/numbers mode, use the Zi button on the teleprinter or Left-Ctrl. The Bu button (or Right-Ctrl) switches back to letters mode.
Use the Tutorials menu, top-left, to learn more about how to send/receive and set the Lorenz
Virtual Lorenz allows you to connect to another Virtual Lorenz across the internet (or locally in another browser window).
This is the name that you will appear as to other users when connected. Please enter just alphanumeric characters and no spaces.
This option will allow you to experience receiving a real message. Connecting to this server will automatically generate a new random QEP code and encipher a message. Once you have received your QEP settings, use the Ablesetafel 40 to find the correct starting positions, set the Lorenz wheels, send UMUM in plaintext to show you are ready and switch on the Lorenz. The actual enciphered message will then be transmitted shortly afterwards. Can you set your Lorenz correctly?
This section lists other Virtual Lorenz simulations running which you can request to connect to. If no-one is available, you can always try running two browser tabs yourself and connect between them.
This can be used to export or import Lorenz settings.
There are two separate export formats: one for Lorenz type and one for Tunny/Colossus. The reason for this is that the Lorenz machine's wheels step counting backwards (from 43 down to 1 for Chi 1 for example). When Bletchley Park started decoding the messages received, they hadn't seen the Lorenz so counted the pins increasing from 1 upwards for each step. This means when using the wheel settings or start positions from or to Tunny or Colossus, we must convert the pin numbers to get the same result (43 becomes 1, 42 becomes 2 etc).
To import your own wheel settings and start positions, use the same format as the export, making sure the EXPORT FORMAT option is set to TUNNY or LORENZ as appropriate.
This is a list of example encoded messages that you can try out. Most are the examples from Tony Sale's Virtual Tunny and Virtual Colossus (the original can be found at http://www.codesandciphers.org.uk/index.htm)
Select a message to load both the message (an encoded ITA2 transmission) and the start settings. Clicking the "recv cipher" button on the document should begin the reception and decoding.
Note: Some of these can take a while to receive - the Lorenz only ran at 50 baud! (about 6-7 character a second)
Try loading a message then changing even just one of the wheel start positions - you'll see what happens if you don't know the start code or settings!
2041 characters long. Start Positions: X: 31,1,1,15,1 S: 32,36,11,9,43 M: 59,26
9872 characters long. Start Positions: X: 31,5,10,15,8 S: 32,36,11,9,43 M: 59,26
5667 characters long. Start Positions: X: 31,5,10,15,8 S: 32,36,11,9,43 M: 59,26
5667 characters long. Start Positions: X: 17 29 7 11 18 S: 10,28,18,23,26 M: 22,12
5667 characters long. Start Positions: X: 17 29 7 11 18 S: 10,28,18,23,26 M: 22,12
5667 characters long. Start Positions: X: 17 29 7 11 18 S: 10,28,18,23,26 M: 22,12
7023 characters long. Start Positions: X: 34,12,18,18,9 S: 32,28,24,11,44,6 M: 50,6
Gil Hayward, 1917-2011 : To ensure that Tunny was set up correctly and to impress Tommy Flowers, Hayward devised a test which involved the user typing in the phrase 'NOW IS THE TIME FOR ALL GOOD MEN TO COME TO THE AID OF THE PARTY'. The pins and wheels were set so that the resulting ciphertext would be 'I WANDERED LONELY AS A CLOUD THAT FLOATS ON HIGH OER VALES AND HILLS'.