I think the privacy of individual is one of the most important and the most basic right of human. Government can not and also does not have the right to invade the privacy of individual. Every one has his or her own secret, other people should respect him or her. This, of cause, does not mean that the national security is not important. The National security is definitely very important. It protect individual from terrible things. However, this mind could not be controlled easily, which means the government could grabs the right from civilians by the same reason. Because such behavior is difficult to limit, common people might always lose their privacy without perception, like the PRISM. In this event, if Snowden had not told the truth to the public, American people would have never known this kind of thing happening to them. What is more, surveillance is only a small part of national security, the government could try other methods to improve its ability to protect the national security, so the surveillance is not necessary. By the way, this kind of project could easily become a control to people rather than a protect of people. Thus, compared with national security, individual’s privacy is much more important.