A User Authentication System Using Schema of Visual Memory

Abstract

On many image-based user authentication systems, they have to present a user’s pass-image on their display at each authentication trial, so they can be vulnerable against an observing attack. This paper proposes a user authentication system using “unclear images” as pass-images, in which only the legitimate users are allowed to see the original images corresponding to the unclear pass-images in the enrollment phase. The legitimate users can easily remember their unclear pass-images by using the original images as clues, while illegal users without the clues have difficulties to find out and remember the other user’s unclear pass-images.