A couple summers ago, myself and some fellow interns were considering looking at android file vault applications as a research project. We downloaded a bunch of

A couple summers ago, myself and some fellow interns were considering looking at android file vault applications as a research project. We downloaded a bunch of the top rated free ones and they were all universally crap. I think the most secure one just ran the entire file through a substitution cipher. There were plenty of others that would just swap the file header with something else, or just XOR the file with some constant value. When I read this blog post, all I could think was "Yeah, looks about right".