Visual password scheme using bag context shape grammars

Abstract

In this paper, we implemented the similar images generated by bag context shape grammars as distractors in a prototype visual password scheme. A bag context shape grammar is a shape grammar that uses spatial rules to generate images in a regulated manner. That is, during the generative process, bag context is used as a technique to control when a shape grammar rule should be applied. The prototype visual password scheme is used to measure user experience as to whether users can remember their passwords immediately after enrolment and one week after enrolment. This is to ascertain whether the similar images generated using bag context shape grammars are good as a distractor for visual password scheme. The prototype visual password scheme is also built for shoulder surfing and guessing attacks resistance. The outcome of this study shows that bag context shape grammars are good for the generation of similar images as distractors for visual password schemes.