On the Subject of Mechanus Cipher
A cipher named after the plane of order, where a creature lurks to bring structure.
The module displays two rows of lettered panels, an extra lettered panel, a submit panel, and two lettered gears.
You can press any of the panels on a row to flip that row. The top row shows an encrypted word, a keyword and a binary string. The bottom row shows two sets of numbers and a second keyword. The extra panel shows a key letter.
To solve the module, decrypt the word following the steps below and submit it using the gears. To submit, press the gears to turn them, and press the submit button when you want to enter the selected letter. You can flip the panels to clear your input.
Decrypting the word
Step 0 - Creating your key
For steps 2 and 3 you need a key. To make this key, take your keyword from the top row and repeat it until you have 26 letters. Then, for all letters in this string in reading order, if a letter has already occurred, shift it forward in the alphabet until this is not the case.
Example: TROUPER -> TROUPERTROUPERTROUPERTROUP -> TROUPESVWQXYFZABCDGHIJKLMN
Step 1 - Pancake Transposition
Take your encrypted word from the top row and the two number strings on the bottom row. Take the first number from both number strings and mirror the group of letters that are positioned between and including those two numbers. Repeat for the other numbers in the strings.
Example: EOISDYN, 1223236 2456565
EOISDYN 12 -> OEISDYN
OEISDYN 24 -> OSIEDYN
OSIEDYN 25 -> ODEISYN
ODEISYN 36 -> ODYSIEN
ODYSIEN 25 -> OISYDEN
OISYDEN 36 -> OIEDYSN
OIEDYSN 56 -> OIEDSYN