Achieving Rights Untransferability with Client-Independent Servers

Authors:
Josep Domingo-Ferrer
Affiliations:
Statistics and OR Group, Departament d'Enginyeria Química, Universitat Rovira i Virgili, Autovia de Salou, s/n., 43006 Tarragona. E-mail jdomingo@etse.urv.es
Venue:
Designs, Codes and Cryptography
Year:
1996

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Abstract

This article presents a scheme for enforcing access rights untransferability in a client-server scenario. Assumptions include a central authority and servers which are trusted and hold no access information about clients. For a client sharing none of her rights, usurpation of a right seems as hard as the discrete logarithm. Also, rights sharing between clients does not compromise their non-shared rights when a sound public-key cryptosystem is used. Transferring rights between clients without the authority's contribution cannot be done if a sound public-key cryptosystem is used. However, only control on partial rights transfers is addressed in this paper, which does not deal with total identity transfer or alienation.