Moxie Marlinspike gave a talk at DEFCON 19 about how broken the CA model is and suggested an alternative.
The talk - https://www.youtube.com/watch?v=pDmj_xe7EIQ The alternative - http://convergence.io/
The talk - https://www.youtube.com/watch?v=pDmj_xe7EIQ The alternative - http://convergence.io/