Instructions provided in project. Works by trying every possible word and looking for a match. If you want to encode a message, just search "Vigenere cipher" or something like that. This project is just for fun, and it's not to be taken seriously. The shorter the key, the faster. I suggest three letters max. Might optimize this, but probably not.
Demo messages: F hkflgbg qkfv rvfqd d Duxyfwv Ixoiv cdk vfwb. Dthprjh pklz, YWT. --Doefwbu1227 Howz wz bvh avl algzons fcb oys scvypbn tvf. --Hfiwasy1227