On the Subject of the Rozier CM
A machine that knows no bounds when it comes to ciphers.
The table on page 2 will be referred to as the Tabula Recta.
If the Submit Button is white, follow the instructions under Encrypt Instructions. Otherwise follow the instructions under Decrypt Instructions.
Encrypt Instructions
- Use the Nth letter of the encrypted word as the column in the Tabula Recta.
- Find the Nth letter of the keyword on screen 1 within the column.
- Find the (N + 1)th letter of the keyword on screen 1 within the row.
- The column you ended up on becomes your Nth decrypted word.
Decrypt Instructions
- Use the Nth letter of the encrypted word as the column in the Tabula Recta.
- Find the (N + 1)th letter of the keyword on screen 1 within the column.
- Find the Nth letter of the keyword on screen 1 within the row.
- The column you ended up on becomes your Nth decrypted word.
Do this for each letter of the encrypted word and the keyword to get your decrypted word.
When you reach the end of the keyword, treat it as if it wraps around to the beginning of the keyword.
Example 1
Encrypted Word: LWOX
Keyword: WOMAN
Using Encrypt Rules
L + WO → D
W + OM → U
O + MA → C
X + AN → K