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Journal: Symmetry, 2019
Volume: 11
Number: 1087

Article: Preventing Shoulder-Surfing Attacks using Digraph Substitution Rules and Pass-Image Output Feedback
Authors: by Lip Yee Por, Chin Soon Ku and Tan Fong Ang
Link: https://www.mdpi.com/2073-8994/11/9/1087

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