Thursday's reports described how some of the NSA's "most intensive efforts" focused on Secure Sockets Layer, a type of encryption widely used on the Web by online retailers and corporate networks to secure their Internet traffic. One document said GCHQ had been trying for years to exploit traffic from popular companies like Google, Yahoo, Microsoft and Facebook.
GCHQ, they said, developed "new access opportunities" into Google's computers by 2012 but said the newly released documents didn't elaborate on how extensive the project was or what kind of data it could access.
Even though the latest document disclosures suggest the NSA is able to compromise many encryption programs, Snowden himself touted using encryption software when he first surfaced with his media revelations in June.
During a Web chat organized by the Guardian on June 17, Snowden told one questioner that "encryption works." Snowden said that "properly implemented strong crypto systems" were reliable, but he then alluded to the NSA's capability to crack tough encryption systems. "Unfortunately, endpoint security is so terrifically weak that NSA can frequently find ways around it," Snowden said.