On the Subject of the Trifid CM

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

Create a key using the keyword on screen 1 and the Boolean Expression on screen A. Then write these digit strings underneath the key:

11111111122222222233333333
11122233311122233311122233
12312312312312312312312312

This will be referred to as the Trifid Key.

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

Encrypt Instructions

• Turn each letter of the encrypted word into a 3 digit number using the Trifid Key.
• Write each 3 digit number top to bottom, left to right, creating 3 rows of N digit numbers.
• Read the numbers left to right, top to bottom to get a new sequence of numbers.
• Take each 3 digit number and translate it back into a letter using the key you made.

Decrypt Instructions

• Turn each letter of the encrypted word into a 3 digit number using the Trifid Key.
• Write each 3 digit number left to right, creating 3 rows of N digit numbers.
• Read the numbers top to bottom, left to right to get a new sequence of numbers.
• Take each 3 digit number and translate it back into a letter using the key you made.

You should now have an decrypted word. N equals the length of the encrypted word.

Example 1

Encrypted Word: IFCPYA
Key: BDFGHIJKLMNOPQRSTUWXYZCAVE
Using Encrypt Rules

IFCPYA → 123 113 322 221 313 323

1	1	3	2	3	3
2	1	2	2	1	2
3	3	2	1	3	3

113 233 212 212 332 133 → FUNNEL

Decrypted Word: FUNNEL

Example 2

Encrypted Word: BVKGTCU
Key: BYPASCDEFGHIJKLMNOQRTUVWXZ
Using Decrypt Rules

BVKGTCU → 111 322 222 211 313 123 321

1	1	1	3	2	2	2
2	2	2	1	1	3	1
3	1	2	3	3	2	1

123 121 122 313 213 232 211 → CASTING

Decrypted Word: CASTING