Secure and Usable PIN-Entry Method with Shoulder-Surfing Resistance. - Mun-Kyu Lee; Hyeonjin Nam (HCI (29), 2013)

Secure bimodal PIN-entry method using audio signals. - Mun-Kyu Lee; Hyeonjin Nam; Dong Kyue Kim (Comput. Secur., 2016)

Analysis and Improvement on a Unimodal Haptic PIN-Entry Method. - Mun-Kyu Lee; Jin Yoo; Hyeonjin Nam (Mob. Inf. Syst., 2017)