"Encryption works. Properly implemented strong crypto systems are one of the few things that you can rely on. Unfortunately, endpoint security is so terrifically weak that NSA can frequently find ways around it." - http://www.theguardian.com/world/2013/jun/17/edward-snowden-...

Bruce Schneier has said something similar, having seen some of the guardian documents. https://www.schneier.com/blog/archives/2013/09/the_nsas_cryp...