Kemp and Wilson's "Quilt Code" website is unfortunately in frames, so it's impossible to provide a link that'll take you right to that page. However, I've provided a permalink to their home page, where you'll find a FAQs link. Click on that, and you'll see the second paragraph in yellow type reads "Jewish people used Quilts during the World War to let others know when Nazi presence made it dangerous to come and go."

Thanks very much for pointing out the danger behind revisionist myths like the "Quilt Code". I think I'd use a different adjective than "naive".