That is not how I understand ThinThread. Rather, ThinThread does bulk collection, and then applies "crypto" to the problem of keeping the wrong people from seeing domestic communications.
The premise of ThinThread is, like other NSA programs, that NSA gets carte blanche access to the AT&T and Verizon firehose.
The premise of ThinThread is, like other NSA programs, that NSA gets carte blanche access to the AT&T and Verizon firehose.