Affiliation: | (1) Department of Mathematics, Aarhus University, DK-8000 Aarhus C, Denmark;(2) Cryptomathic A/S, Forskersparken, DK-8000 Aarhus C, Denmark;(3) IWR, Universität Heidelberg, D-6900 Heidelberg, Germany;(4) Utility Consultants International, D-6000 Frankfurt, 71, Germany |