关键词: 图像变形;图像反变形;用户认证;用户察知;信息隐藏

Abstract:

Consciously or unconsciously, we are using many kinds of “cards” in our daily lives. Among them, credit card, cash card, driving license, etc., are as important as our wallets. To prevent the cards from being illegally used, card user authentication is indispensable. A common practice for user authentication is to ask the user to provide some personal information. The user is usually considered legal if the personal information matches the one prestored in the card. However, if the personal information is leaked, some third party may use the card illegally. The purpose of this paper is to propose an image morphing based method for card user authentication. The fundamental idea is to hide the face image of the true card holder into some cover data through morphing, distribute the key information for restoring the face image into several different places, and restore the face image through demorphing when the card is used. This method can provide good user awareness for authorized persons, and can protect the true card holder more effectively.

Key words: image morphing;user authentication;user awareness;demorphing;stegonography