Patrick Ball has a good and highly accessible article over on Wired about why certain means of securing communications are problematic. It’s highly recommended. Rather than leave you with the overview of “this is what is said and why it’s important,” let me leave you with a key quotation from the article that (to my mind) nicely speaks to the author’s general mindset: “Good security is about not trusting people. It’s about studying math and software and assuring that the program cannot be turned to bad intent.”