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This paper presents a new interaction technique for pass code inputting in a handheld device. This method adopts a tangential force to unlock the device instead of touch passwords or drawing patterns that require looking at the display. A user can grasp a mobile phone and apply pressure onto the display surface without having to look at the display. A tangential-force-based interface is implemented for a smart phone. The interface is devised to receive four directional force inputs: up, down, left, and right. The feasibility of the proposed method was evaluated, and it was found that a 92% success ratio can be achieved.

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