Card user awareness based on linear sub-space representation

Nowadays, “cards” are becoming part of our lives. To prevent the cards from being illegally used, card user authentication is indispensable. A common practice for user authentication is to use some secret information known or possessed by the true card holder. However, if the secret information is leaked, some malicious third party may still be able to use the card illegally. To solve the problem, this paper proposes a new authentication method based on linear sub-space representation. The basic idea is to hide the face image of the card holder into some other images, distribute the key information for restoring the face image into several places, and restore the face image when necessary. Compared with the methods we proposed earlier, the new method is more efficient, and is easier to implement.