usage: 
/enigma channelnumber <1-10>: the channel you want to use
/enigma key <string>: the key you want to use (case sensitive)

when you send a message to the selected channel it will be encrypted


a word about the encryption algorithm: 
effectively a substitution with length(key) alphabets, therefore it's a rather weak encryptiopn, but strong enough to fulfill it's purpose: hide the messages from unwanted people. 