Dictionary based SMS encryption

I am trying to create end to end SMS encryption application, but don't want to use standard encryption algorithm.The idea is to convert the text of message开发者_如何学Go to completely different meaningful text so that over the network it doesn't seem encrypted. I am assuming messages only in English language. In implementation part, I have first compressed the message using huffman encoding which gives me compressed stream of bits. Now for encryption I don't have any idea. Is it possible to build a dictionary of some random text or what other way can be used for getting such encryption? Decryption at other receiving end is also required.

Are you asking for a a codebook? If you have access to an English language dictionary of 65536 entries for example, you can take every 16-bits of your message as an index into this table to get a word. Good luck converting this into a real cryptosystem.