..., trying combinations of dictionary words with numbers. If that fails, brute force will be used.
For all attempts of the dictionary attack, only keys within the known key length range will be generated.
Better ranking system and analysis of possible decoded messages.
Note:
The version currently released, I made in an evening! It is nowhere near ready for release but is a fun project to think about and I need more ideas for improvements mentioned above.
Discuss possible solutions and ideas!