On the Subject of The Inverted Gray Cipher
This cipher might seem gray and bleak and boring. Well, I must say... you’re not wrong.
On the module, you will see 3 screens, a keyboard, 2 arrows, and a submit button that displays the current page you’re on.
Pressing the right arrow takes you to the next page. Pressing the left arrow takes you to the previous page. There is a total of 1 page.
On page 1, the top screen shows a 6 letter encrypted word, the middle screen shows a word, the bottom screen shows a 6 digit binary string.
Follow the mechanics down below to decrypt your word:
Step 1: Portax Cipher
For this, you’re going to need the encrypted word from the top screen of page 1 and the 3 letter key on the top screen of page 2.
You will also need this cipher table that consists of 4 rows of letters, divided into 2 subgroups of 2 rows:
Split the encrypted word in half so you have 2 3 letter strings. Place the 2nd half under the 1st half. Each column is treated like a letter pair reading top to bottom. For each letter pair, do the following:
- Shift the top row so that the letter A aligns with the letter on the 3rd/4th row that is the same letter as the Nth letter of the key.
- Find the 1st letter in the pair in the 1st/2nd row that is within the length of the top row.
- Find the 2nd letter in the pair in the 3rd/4th row that is within the length of the top row.
- If the 2 letters are in the same column, the 1st letter will be replaced with the letter in the 1st/2nd row and the 2nd letter will be replaced with the letter in the 3rd/4th row.
- Otherwise, replace the 1st letter with the letter in the same row as the 1st but in the same column as the 2nd. And replace the 2nd letter with the letter in the same row as the 2nd but in the same column as the 1st.