## On the Subject of the Notre-Dame CM

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

From the Notre-Dame Cipher module by Konoko.

This cipher uses 2 pages.

Create a key using the keyword on screen 1 and the Boolean Expression on screen A. Make sure to replace any Qs with Zs. Rearrange the key into a 5×5 matrix. Keep a copy of this matrix for the last step.

Scramble the starting matrix to get the ending matrix by following the instructions below:

#### Rosace Cipher

• Locate the cell on the Nth number screen on page 1 using the letter for the column and the number for the row.
• Locate the 3 other cells using 90° rotations along the center of the matrix.
• If the character on the Nth letter screen on page 1 is a '>', swap the 4 cells clockwise.
Otherwise, swap the 4 cells counter-clockwise.

#### Vitrail Cipher

• The number on the Nth number screen on page 2 will be referred to as the Key Number.
• The 1st number of the Key Number points to the starting column and the 2nd number the ending column.
• Take the X letters from the top of the starting column, where X is the 3rd number of the Key Number, and stack them one by one on top of the ending column.
• Also take the X letters from the bottom of the ending column and stack them one by one at the bottom of the starting column.

#### Cross Cipher

• The 1st number on the Nth letter screen on page 2 will be used as the column, while the 2nd number will be used as the row.
• WITHOUT MOVING the letter in the intersection of these two, swap their content while keeping the reading order (top goes to left, right goes to bottom, and vice-versa).

If the Submit Button is white, find each letter of the encrypted word in the starting matrix and replace it with the letter at the same position in the ending matrix.
Otherwise, find each letter of the encrypted word in the ending matrix and replace it with the letter at the same position in the starting matrix.

Finally, if any of the letters on page 2 screen 4 match at the same position as any of the letters of your encrypted word, replace that letter with a Q. You should now have an decrypted word.

#### Example

Encrypted Word: HUPYWF
Page 1, Screen 1A: A1 >
Page 1, Screen 2B: B5 <
Page 1, Screen 3C: B3 <
Page 2, Screen 1: 314
Page 2, Screen 2: 124
Page 2, Screen 3: 512
Page 2, Screen A: 23
Page 2, Screen B: 42
Page 2, Screen C: 25
Page 2, Screen 4: IFPMOP
Using Decrypt Rules

#### Rosace Cipher

 C A T H O U A T H C U A T S C U A T S C L I B D E L I B D E H I B D E H I K D E F G J K M F G J K M F G J K M F B J Z M N P Z R S N P Z R S N P Z R V N P G R V U V W X Y Y V W X O Y L W X O Y L W X O

#### Vitrail Cipher

 U A T S C G A W S C U T W S C E T W S M H I K D E J I Y D E L K Y D E C K Y D V F B J Z M K B N Z M P J N Z M U J N Z O N P G R V T P F R V B G F R V L G F R I Y L W X O U L H X O I A H X O P A H X B

#### Cross Cipher

 E T W S M E U W S M E U W C M E P W C M C K Y D V C N Y D V S G R D X S H R D X U J N Z O T J K G A T J K N A T V K N A L G F R I L Z F R I L Z F Y I L B F Y I P A H X B P O H X B P O H V B U O G J Z

#### Decrypting

 C A T H O E P W C M L I B D E S H R D X F G J K M T V K N A N P Z R S L B F Y I U V W X Y U O G J Z

HUPYWF → IUARTZ

IUARTZ + IFPMOP → QUARTZ

Decrypted Word: QUARTZ