概要：美国国防部副部长阿什顿?卡特18日说，国家安全局正在推行新的安全守则，以防爱德华?斯诺登泄密事件重演。

　　卡特当天在科罗拉多州阿斯彭举行的阿斯彭安全论坛上宣布这一消息。他说，国家安全局新采取的安全守则主要为两条，第一条是在调阅高度机密信息时启用“两人守则”，涉及这类信息的工作必须两个人同时操作才能完成。此外，国家安全局还对高度机密情报的储存与调阅作出新的限制。

　　卡特说，在“9?11”恐怖袭击事件之后，为加强情报共享，大量情报被汇总到一个地方，这一做法目前看来是个错误，将所有信息上载到一个服务器里有极大风险。

　　按照美国国家安全局局长基思?亚历山大的说法，“棱镜”项目曝光者斯诺登正是从一个汇总了各处情报的内部站点上得到其泄露的大量信息。

　　NSA seeks new security measures after Snowden case

　　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. (新华网)