Graphical system and method for user authentication

摘要

System and method for graphical user authentication using compact collages of regions of images. Image corpus is constructed by selecting similar quality images and filtering to further homogenize image quality. Regions are detected within the images and scored according to similarity and neighborhood information. Regions with lower scores provide less information about other regions and are more secure secrets. During enrollment, user selects secret images; decoy images are chosen by the system accordingly. Regions from secret images are selected as secrets according to the scoring of regions and regions from decoy images are selected as decoys. A collage is formed with secrets and decoys. Compact rendering enhances security and is suitable for small displays of mobile devices. Several rounds of challenge, requiring identification of secrets, are presented to the user. User is authenticated if a certain number of correct identifications of secrets within a number of rounds are achieved.