How about you remove the encription functionality(just a packer), and release it as a freeware,
or warn that the encryption is not 100% secure and release it as cheapie-ware?

Then the interest in the freeware, or the money you make on the cheapieware,
can help you decide on whether to spend the time securing your algorithms...

As well as it means your core-code can get good a testing before being implemented in LED.