I'm the author of umshade (http://umshade.it), which aims to bring a chrome extension that provides proof-of-concept grade text-encryption to any website. Obviously I like what you did a lot. How much further are you taking it? What other approaches to UI/flows did you consider?
How far I take it depends largely on feedback I receive. I have now completed this research project so in that capacity it is complete.
I considered a number of flows but eventually decided this was most discrete. Check out the paper I link to at the bottom of my post to read all about the options I considered and why I selected this one.
