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1.Introduction In June 2013,Edward Snowden,a former consultant of the National Security Agency(NSA),revealed to two newspapers that the NSA was engaged in an ongoing program of collecting telephone and Internet metadata for nearly every person in the United States.This shocking news raised the public awareness of the personal information protection,especially on the Internet.With the rapid development of the Internet technology,the security
1. Introduction In June 2013, Edward Snowden, a former consultant of the National Security Agency (NSA), revealed to two newspapers that the NSA was engaged in an ongoing program of collecting telephone and Internet metadata for nearly every person in the United States. This shocking news raised the public awareness of the personal information protection, especially on the Internet. What the rapid development of the Internet technology, the security