Keys: Is This Way of Encryption Already Invented? I've invented a way of encryption where there are keys which represent a certain cipher alphabet, whether it be a scrambled alphabet, shifted alphabets, numbers or symbols/pictographs. 

For example, a letter R with the number 2 above it equals E in Rot13 but, and R with a 1 above it is I in Atbash. 

Is this method already invented?
Maybe not the precise scheme, but having elements in the key select a particular cipher is pretty common - mainly by persons starting crypto. All in all they are generally not secure and end up discussing Kerckhoffs's principle.

It is not easy to create a modern, secure cipher by alternating between a lot of insecure classical ciphers. No doubt it can be done, but this scheme is not intricate enough for that; it will fail basic randomness tests and will probably fall to frequency analysis as well.