Development of keypads which use colors or shapes to prevent shoulder surfing

Ryo Masuzawa, Kentaro Aburada, Hisaaki Yamaba, Tetsuro Katayama, Naonobu Okazaki. Development of keypads which use colors or shapes to prevent shoulder surfing. Artif. Life Robotics, 28(4):710-717, November 2023. [doi]

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