The World Wide Web is evolving from a platform for infor- mation access into a platform for interactive services. The interaction of the services is provided by forms. Some of these services, such as bank- ing and e-commerce, require secure, non-repu

Abstract—Recently, a 3D face recognition approach based on geometric invariant signatures, has been proposed. The key idea of the algorithm is a representation of the facial surface, invariant to isometric deformations, such as those result