On the Subject of the Blue Cipher

Blue is often to describe sadness. Luckily for you, this cipher will cheer you up.

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 2 pages.

On page 1, the top screen shows a 6 letter encrypted word, the middle and bottom screen shows an 6 digit number.

On page 2, the top screen an 6 letter word.

Follow the mechanics down below to decrypt your word:

Step 1: Atbash Cipher

Take the encrypted word from the top screen on page 1 and turn each letter into it's alphanumeric position (A = 1, B = 2... Z = 26)

Next, take 27 minus each number to get a new number between 1 - 26.

Convert the number back into a new letter.

Step 2: Letter Transposition

For this, you will need the 2 6 digit numbers on the middle and bottom screens on page 1. Take the 1st number from the middle screen to use for the column. Then take the 1st number from the bottom screen to use for the row. Use both numbers of the table below to get an instruction.

0123456789
03416142425234534R424
12614RV15R23456R32625
223RVR1RV12253646R225
33512462445R5131526R5
4R1131416351235R325R4
52345R3461636R4R534R2
61312RV12R33536153623
7452456R4R5R235235646
8RV26R113135615152434
936R11456164516142646



  • ##: Switch the 2 letters at those positions.
  • R#: Shift the whole word to the right # times.
  • RV: Reverse the entire sequence.

Do this for each digit on the 2 screens to complete the transposition process.

Step 3: Vigenere Cipher

On page 2 of the module, the top screen shows a word

Take the first letter of your encrypted word and the first letter on the top screen and translate them into numbers using the table below.

Now take the first number minus the second number, and then turn the new number back into a letter with the same table.

If the number is negative, add 26 until the number is between 0 - 25.

Repeat for each letter.

A8H13O14V9
B0I7P3W17
C16J22Q19X15
D12K23R4Y20
E5L6S21Z24
F11M18T25
G10N1U2