May is not alone here. The regime she proposes is already in place in countries like Syria, Russia, and Iran (for the record, none of these countries have had much luck with it). There are two means by which authoritarian governments have attempted to restrict the use of secure technology: by network filtering and by technology mandates.
<img src="http://68.media.tumblr.com/792dbdae3e360aafaf6953f174fe4789/tumblr_n1wag7I4RL1qefv2ko1_400.gif" width="400" height="400">
Um…that alone ought to give her pause…
/FFS