NSA implements new security measures after Snowden case U.S. NSA is implementing new security measures, Deputy Defense Secretary Ashton Carter said. Systems administrators must now work with a colleague when accessing sensitive intelligence. Carter said the NSA is now working to limit access to sensitive data. WASHINGTON, July 18 (Xinhua) -- U.S. National Security Agency (NSA) is implementing new security measures after disclosures made by former contractor Edward Snowden put the agency under the spotlight, Deputy Defense Secretary Ashton Carter said Thursday. Carter made the remarks at the Aspen Security Forum held in Colorado. He said systems administrators like Snowden must now work with a colleague when accessing sensitive, compartmented intelligence. He said the "two-man rule" is based on the model of how nuclear weapons are handled, which requires two computer systems administrators to be working simultaneously when they are inside systems that contain highly classified material. Furthermore, Carter said, the NSA is now working to limit access to sensitive data. In an effort for those in the intelligence community to be able to share with each other, there was an enormous amount of information concentrated in one place. That's a mistake," he said. The loading of everything onto a server creates a risk. According to NSA Director Keith Alexander, Snowden accessed much of the information on a single internal site designed to share information. Pentagon to field 4,000-person cyber squad WASHINGTON, July 18 (Xinhua) -- U.S. Defense Department is close to launching a roughly 4,000-person cyber squad devoted to conducting cyber offense and defense operations, Deputy Defense Secretary Ashton Carter said Thursday. Carter made the disclosure at the Aspen Security Forum, held in Aspen, Colorado, saying "I wanted to start this fast." He said even at a time of budget constraints the Pentagon is "spending everything we think we can spend wisely" on developing the skills related to such missions.