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August 2, 2018


H4PLock is a mobile lock screen which employs sequences of user-generated invisible gestures performed on one or more of four quadrants on a mobile screen. 


Research Areas

Design; Security. 


My Involvement

I developed a lock screen emulator Android app using the Android Development Kit in JAVA. 

I designed and ran user studies.

I was the lead author on an iConference paper. 



University of Maryland Baltimore County (UMBC).



  • Ali, Abdullah; Kuber, Ravi; Aviv, Adam J. “Developing and Evaluating a Gestural and Tactile Mobile Interface to Support User Authentication”. iConference 2016

  • Abdullah Ali, Ravi Kuber, Adam J. Aviv. (2015) “H4Plock: Supporting Mobile User Authentication through Gestural Input and Tactile Output” The Symposium on Usable Privacy and Security 2015

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