Scramble or not, that is the question a study of the security and usability of scramble keypad for PIN unlock on smartphones. - Geetika Kovelamudi; Jun Zheng 003; Srinivas Mukkamala (ICCC, 2016)

On the adoption of scramble keypad for unlocking PIN-protected smartphones. - Geetika Kovelamudi; Bryan Watson; Jun Zheng 003; Srinivas Mukkamala (Int. J. Inf. Comput. Secur., 2021)