On the Subject of the Grille CM

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

Use the shape that has the same amount of sides equal to the length of the encrypted word:

Rotate* the shape an X amount of times where X is equal to the letter on screen 1, converting it to a Value via the Value Table.

If the Submit Button is white, follow the instructions under Encrypt Instructions. Otherwise follow the instructions under Decrypt Instructions.

Encrypt Instructions

• Fill in each point of the shape with the letters of the encrypted word in reading order.
• Take off the letter that is at the point where 1 is.
• Take off the letter that is at the point where 2 is.
• Rotate* both 1 and 2.
• Do this until each letter has been taken off to get a decrypted word.

Decrypt Instructions

• Take off the 1st letter of the encrypted word and place it at the point where 1 is on the shape.
• Take off the new 1st letter of the encrypted word and place it at the point where 2 is on the shape.
• Rotate* both 1 and 2.
• Do this until each letter has been placed on the shape.
• Read the letters in reading order to get a decrypted word.

Rotate* - One rotation makes it so the point at the top of the shape is now at the position of the next point in clockwise order. The numbers rotate to the next point in clockwise order.

Example 1

Encrypted Word: YSETSCA
Key Number: 1
Using Encrypt Rules

Y
S      E¹
T            S
C²      A

Y
S      *
T²            S¹
*      A

Y
S²      *
*            *
*      A¹

Y²
*      *
*            *
*¹      *

YSETSCA → ECSTASY

Decrypted Word: ECSTASY

Example 2

Encrypted Word: ENDGFA
Key Number: 5
Using Decrypt Rules

*
E¹      *
*        N²
*

D¹
E      *
*        N
G²

D
E      F¹
A²        N
G

ENDGFA → DEFANG

Decrypted Word: DEFANG