On the Subject of the Slidefair CM

A machine that knows no bounds when it comes to ciphers.

The key below will be referred to as the Slidefair Key:

ABCDEFGHIJKLMNOPQRSTUVWXYZ
ABCDEFGHIJKLMNOPQRSTUVWXYZ

Split the encrypted word into pairs of letters. If there is an odd amount of letters, leave the last letter as the odd letter.

For each letter pair, do the following:

  • Shift the bottom alphabet of the Slidefair Key so that the leftmost letter is the Nth letter shown on screen 1.
  • Take the Nth letter pair and find the 1st letter in the top row and the 2nd letter in the bottom row.
  • If the 2 letters share the same column, replace each letter with the letter that is on the opposite end of their row.
  • Otherwise, replace each of them with the letter on the same row but in the column of the other letter in the original pair.

Example

Encrypted Word: SJIKH
Screen 1: WC

ABCDEFGHIJKLMNOPQRSTUVWXYZ
WXYZABCDEFGHIJKLMNOPQRSTUV

SJ → NO

ABCDEFGHIJKLMNOPQRSTUVWXYZ
CDEFGHIJKLMNOPQRSTUVWXYZAB

IK → RT

Decrypted Word: NORTH