Abstract APPLICATIONS OF FINITE GEOMETRY TO CRYPTOGRAPHY A. Beutelspacher Justus-Liebig University Gießen, F.R.G. In this paper we survey several applieations of classieal geometrie structures to cryptology. Particularly we shall deal with authentication schemes, threshold schemes, network problems and WOM-codes. As geometrie counterparts we shall nearly exclusively deal with projective spaces and their internal structures provided by, for example, linear subspaces, Baer subspaces, quadrics, etc. G. Longo et al. (eds.), Geometries, Codes and Cryptography © Springer-Verlag Wien 1990