The New York Times has published documents that show how the National Security Agency worked against encryption. Here is the link.
The excerpts from NSA’s 2013 budget request, outline the ways in which the agency circumvents encryption over the Internet. The Sigint Enabling Project involves industry relationships, clandestine changes to commercial software to weaken encryption, and lobbying for encryption standards it can crack, according to the NYT.
You can read the related article by Nicole Perlroth and Scott Shane here.