Ladar Levison is probably most well-known to Ars readers as the founder of the secure e-mail service Lavabit, which he shut down in mid-2013 in an effort to avoid being forced to comply with a US government demand to turn over users' e-mails. But his latest project is a lot grander in scope than a single hosted e-mail service: Levison is attempting, with the aid of some fellow crypto-minded developers, to change e-mail at large and build encryption into its fundamental nature....