In this paper, we proposed a user authentication method for the period between the user logs in and logs out. It uses user's feature of command sequence. The proposed method is constructed by combining three methods. In the authentication experiment, we selected Schonlau's command sequence data. And we evaluated the proposed method and its accuracy and considered to use it from benchmark in background. Then from the experimental results, we confirmed that authentication accuracy is improved for the proposed method compared with the each single methods and the possibility that the proposed method can be used in the background while the user uses the system.
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