Preventing Shoulder-Surfing Attacks using Digraph Substitution Rules and Pass-Image Output Feedback
Document Type
Article
Publication Date
1-1-2019
Abstract
In this paper, we focus on methods to prevent shoulder-surfing attacks. We initially adopted digraph substitution rules from PlayFair cipher as our proposed method. PlayFair cipher is a modern cryptography method, which exists at the intersection of the disciplines of mathematics and computer science. However, according to our preliminary study it was insufficient to prevent shoulder-surfing attacks. Thus, a new method had to be proposed. In this new proposed method, we improvised the digraph substitution rules and used these rules together with an output feedback method to determine a pass-image. Our proposed method was evaluated with a user study. The results showed our proposed method was robust against both direct observation and video-recorded shoulder-surfing attacks. © 2019 by the authors.
Keywords
Digraph substitution rules, Graphical authentication, Output feedback, Shoulder-surfing, User authentication
Divisions
fsktm
Funders
BKP Special grant number BKS022-2018 from the University of Malaya, Malaysia,Fundamental Re-search Grant Scheme (FRGS) grant number Fp114-2018A from the Ministry of Higher Education, Malaysia
Publication Title
Symmetry
Volume
11
Issue
9
Publisher
MDPI