Identity authentication system based on user behavior pattern and method thereof

The invention relates to an identity authentication system based on a user behavior pattern and a method thereof. The system consists of a user behavior monitor running on a client side and a user identity judging system running on a server. The method comprises the following steps: (I) collecting user browsing histories of users, and establishing a statistic model for each user by an eigenvector extraction method; (II) performing judgment and authentication. According to the system and method provided by the invention, a user behavior model based on the support degree eigenvector is established by use of the browsing histories of the users. The system and method provided by the invention have perfect expandability, portability and universality, cause a small load on the server and do not need the third-party software support.