I recommend Jacob Applebaum's presentation (I only watched part 2. You don't necessarily have to watch part 1). He talked about these two articles in particular

I recommend Jacob Applebaum's presentation (I only watched part 2. You don't necessarily have to watch part 1). He talked about these two articles in particular: http://www.spiegel.de/international/world/the-nsa-uses-powerful-toolbox-in-effort-to-spy-on-global-networks-a-940969.html http://www.spiegel.de/international/world/the-nsa-uses-power... / http://www.spiegel.de/international/world/catalog-reveals-nsa-has-back-doors-for-numerous-devices-a-940994.html http://www.spiegel.de/international/world/catalog-reveals-ns... in good detail. Pretty impressive (and frightening) stuff.