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In this chapter we will discuss how keystroke dynamics can be used for true continuous authentication. We have collected keystroke dynamics data of 53 participants who used the computer freely and we have analysed the collected data. We will describe a system that decides on the genuineness of the user based on each and every single keystroke action of the current user and we will represent the results in a new manner. The continuous authentication system will lock out a user if the trust in genuineness of the current user is too low. Ideally such a system would never lock out a genuine user and detect an impostor user within as few keystroke actions as possible.