Today, most of smart-phones adopt virtual keyboards as input devices for users. However, there are serious secure threats exit such as key-logger attack that leaks key input values of virtual keyboards. Since the smart-phone provides limited virtual keyboards due to its small screen size, it is more vulnerable for such attacks compared to personal computers (PCs). In this paper, we propose a solution for this problem. Our approach has a unique feature to improve security of the keyboard while maintaining high accessibility against existing solutions. Moreover, we can also apply it to various mobile devices with small screens due to its flexibility in terms of the size.
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