This paper introduces visual authentication and visual identification methods, which are authentication and identification methods for human users based on visual cryptography. These methods are very natural and easy to use, and can be implemented using very common ``low tech'' technology. The methods we suggest are efficient in the sense that a single transparency can be used for several authentications or for several identifications. The visual authentication methods we suggest are not limited to authenticating textual messages, and can be used to authenticate any image.
An important contribution of this paper is the introduction of a framework for proving the security of protocols in which humans take an active part. We rigorously prove the security of our schemes using this framework.
Category / Keywords: Publication Info: Appeared in the THEORY OF CRYPTOGRAPHY LIBRARY and has been included in the ePrint Archive. Date: received Oct 6, 1997. Contact author: bennyp at wisdom weizmann ac il Available format(s): Postscript (PS) | Compressed Postscript (PS.GZ) | BibTeX Citation Discussion forum: Show discussion | Start new discussion