Share Secret Messages

What would you like to do?

Send a secret message Decode a message

Enter some text:

Your Secret Message:

Email your secret message to a friend:

Include encoding settings in your email.

Don't include settings (you plan to tell your friend the settings privately).

Your Settings

Change values below to see how a different cypher key will affect your secret messages!

Current Cypher Key:

(Enter data in the other fields to activate settings.)

Select characters and change your key position.

Characters:

Key Position:

Cipher Key (Optional):

What is this page?

SIGABA cipher machine at the National Cryptologic Museum, with removable rotor assembly on top

You are viewing a cipher that uses a form of monoalphabetic substitution. Messages are encrypted or decoded via a Cipher Key and Key Letter Position. This webpage aims to make it easier and faster to encrypt and decode secret messages.

How does it work?

The Crazed Cat Secret Messages script removes extra spaces and repeated characters from your Cipher Key. The program will shift the selected characters forward by the Key Position. It will substitute the letters in the selection with characters from your Cipher Key, beginning at a shifted point. The script will add characters not found in your Cipher Key to the rest of the selected character string. If no Cipher Key is used, then the program behaves like a Caesar Cipher.

Privacy

Your privacy is important. Crazed Cat does not monitor messages. Feel free to copy and modify the source code and JavaScript on this page.