On the Subject of the Alberti CM
A machine that knows no bounds when it comes to ciphers.
Turn the letter on screen A to a Value via the Value Table. This is your Alberti Offset, you can freely modulo this offset by 26.
If the Submit Button is white, follow the instructions under Encrypt Instructions. Otherwise follow the instructions under Decrypt Instructions.
Encrypt Instructions
- Take the sum of the alphabetic position (A1Z26) of the Nth letter of the encrypted word and the Alberti Offset.
- If the resulting number is above 26, subtract 26 until the number is between 1 - 26.
- Turn the number back into a letter to get your Nth decrypted letter (A1Z26).
- Add the number on screen 1 to the Alberti Offset, freely being able to modulo the result by 26. This is your new Alberti Offset.
Decrypt Instructions
- Take the alphabetic position (A1Z26) of the Nth letter of the encrypted word and subtract it by the Alberti Offset.
- If the resulting number is below 1, add 26 until the number is between 1 - 26.
- Turn the number back into a letter to get your Nth decrypted letter (A1Z26).
- Add the number on screen 1 to the Alberti Offset, freely being able to modulo the result by 26. This is your new Alberti Offset.