One thing I found fascinating about Vula was how the lack of usability of the system was its downfall.

You had highly committed activists, fighting for freedom, up against a murderous regime - and yet they still failed to use the system properly.

Activists left documents unencrypted. Keys were easily obtainable. Some important communications were sent in the clear because people found the software so cumbersome.

We all know that setting up PGP and using it properly is a pain in the neck. Security is usability.

I wrote a bit more about Vula at https://shkspr.mobi/blog/2014/01/the-hardest-problem-in-encr...