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Current authentication systems suffer from many weaknesses. Textual passwords are commonly used. Users tend to choose their nick names, which make textual passwords easy to break. Many available graphical passwords have a password space that is less than or equal to the textual password space. Smart cards can be stolen. Many biometric authentications have been proposed; however, users tend to prevent using biometrics because of their intrusiveness and the effect on their privacy. Therefore, biometrics cannot be revoked. In this paper, the authors present the 3-D password. The 3-D password is constructed by sequence of the interactions and actions which performed by users.
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