transcript for https://www.instagram.com/p/BOu3_X8h1rD/

transcript for https://www.instagram.com/p/BOu3_X8h1rD/

Enigma Z30 Machine Demo
http://tinyurl.com/EnigmaZ30

Shows operating and setting the machine key with the built in setup mode.
Assumes the program is already loaded.
To start the program, from the KIM Uno monitor press [AD] 0500 [GO]

In the main screen, the rotor values are shown and can be changed with the up/down keys under each rotor. Pressing a key encrypts it. From the main screen pushing [B] goes into settings menu.
The rotor types can now be set in option F1, if the rotors 1,2,3 are not used exactly once, pushing B to go to the next menu shows instead EE. The ring settings can be set in option F2. Pushing [GO] in any screen zeroises the settings to the default key.

The video shows:

The display changes to 4321, the default rotor values when the program starts. The two digits on the right show 00. When a key is pressed it will be shown on the left digit and the output on the right digit. This is an enigma machine, a number can never encrypt to itself, 00 which means the machine is ready to encode.

The rotors are then changed by pressing the up/down keys below each rotor. Pressing up on 9 changes the rotor to 0. Pressing down on 0, changes the rotor to 9. The rotors are set to 8888 to show how the 9 propagates all the way to the left due to the double stepping anomaly.

The number 6 is repeatedly encoded. The encrypted output is shown in the rightmost digit. Notice the display never shows 66. The last presed key and its encrypted output will be shown on the screen for 1 second and then cleared automatically. If a rotor is changed with the up/down buttons, it will be cleared as well.

Pushing the [A] button does nothing except to clear the last input key and encrypted output.

The [B] button enters the rotor setup routine. The mode indicator changes from 00 to F1 to F2 and back to 00. The left 4 digits change the last rotor values to 0123 on F1 and 1111 on F2. Those are the default rotor types and ring settings. Pushing [GO] in mode 00 clears the machine key to the default values. The rotors return to 4321

The [B] button is pushed again and the mode changes to F1. The rotor types are shown to be 0123. The 0 in the left is the reflector, which cannot be changed. Pressing the up/down keys below the rotors changes their type. To accept the new values, push the [B] button again. If any rotor is used twice (313), error EE is shown. When all rotors are used exactly once in any combination, pushing [B] changes the mode to F2.

The display changes to 1111 F2. Those are the default ring settings for the rotors. Those can be changed with the up/down buttons to any value from 0 to 9. Pushing [B] again returns to the main screen (mode 00). Pushing [B] again shows the current rotor types in the F1 screen and the ring settings on the F2 screen.

Pressing a [0]..[9] key in mode F1 or F2 has no effect. The machine will not encrypt until returned to the 00 screen.

The value 6666 is encrypted with a custom key, it encodes to 2152. The rotors advance with each key press and end in 4325.

The [B] button is pressed and the machine changes to F1. The rotor types are shown. Pressing [GO] in this screen zeroises the encryption key to its default value and returns the machine to the main screen, mode 00. Pressing [B] again shows that the rotor types and ring settings have been returned to their default values of 0123 and 1111 in the F1 and F2 screens.

The [B] button is pressed until the mode changes to F2. The up and down keys are used to change the ring settings. [B] is pushed repeatedly until we return to F2. Pushing [GO] in this mode also clears the key and returns to the 00 screen

The value 66 now encrypts to 79, instead of 21 as before. This shows the inner machine settings also affect the output. No key is pressed for a second and the output is automatically cleared back to 00.

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