## On the Subject of the Square CM

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

From the Shape Cipher module by TracksJosh.

Create a key using the keyword on screen 1 and the Boolean Expression on screen A. Make sure to replace any Js with Is. Rearrange the key into a 5×5 matrix.

For each letter of the encrypted word, do the following:

- Find the Nth letter of the encrypted word in the matrix.
- Find the Nth letter shown on screen 2 in the matrix.
- Create a 4 sided shape using the 2 letters found in the matrix as the corners.
- Take the sum of the alphabetic positions (A1Y25Z0) of the letters within this 4 sided shape.
- Modulo the result by 26 and turn it back to a letter (A1Y25Z0) to get your Nth decrypted letter.

**Note: The sum of the entire matrix is equal to 341 or 3.**

#### Example 1

Encrypted Word: MYCN

Screen 2: SGBW

B | C | E | F | G |

H | I | K | L | M |

N | O | P | Q | S |

T | U | V | X | Y |

Z | D | R | A | W |

MS → M + S → 32 MOD 26 → 6 → F

YG → G + M + S + Y → 64 MOD 26 → 12 → L

CB → B + C → 5 MOD 26 → 5 → E

NW → N + O + P + Q + S + T + U + V + X + Y + Z + D + R + A + W → 239 MOD 26 → 5 → E

Decrypted Word: FLEE