Nice catch on the new functionality in Rails 4.1, but.... 

The example there just shows verifying, not actual encrypting/decrypting. I could look at the api docs to see if I can figure out a way to use these classes appropriately, they do seem appropriate for our use case, but....

We need this to work in Rails previous to 4.1, right?  4.1 isn't even out yet, is it?

If I write it to use this functionality in Rails 4.1, which I think is what you're recommending, what is your thinking for what to have BL do in pre-4.1 Rails?