Images as graphical password: verification and analysis using non-regular low-density parity check coding

Abstract

The use of mobile computing devices like laptops, smartphones, tablets, etc. ease user access to work or connect remotely for performing a number of operations. Also, with the advent of these new technologies and devices, one of the major concerns emerges in the form of security for one’s personal data or information. Passwords are very critical to human safety as he or she could be a victim of unauthorized access, data misuse or even they may face some legal trouble because of unconventional activities. Robust passwords are recommended in this act to avoid various outbreaks. But, these passwords are not easy to remember in most of the cases. Therefore, an effort has been made in this paper to present a new graphical password-based method that verifies a user’s authenticity by using images as a password. In this regard, a two-way password verification system is adopted using non-regular low-density parity-check codes and an encryption methodology. The performance of the proposed work was evaluated for three different cases i.e. (a) To validate image for about thirteen of modifications (b) To validate image for different format conversion, and (c) Similarity measures for different face images taken from labeled faces in the wild (LFW) database. Results validated the performance of the proposed method when compared with other state-of-the-art approaches.