A method for obtaining digital signatures and public-key cryptosystems
Communications of the ACM
Protection in operating systems
Communications of the ACM
Protection: principles and practice
AFIPS '72 (Spring) Proceedings of the May 16-18, 1972, spring joint computer conference
An improved protocol for demonstrating possession of discrete logarithms and some generalizations
EUROCRYPT'87 Proceedings of the 6th annual international conference on Theory and application of cryptographic techniques
Achieving Rights Untransferability with Client-Independent Servers
Designs, Codes and Cryptography
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A scheme for ensuring access rights untransferability in a client-server scenario with a central authority and where servers hold no access information about clients is presented in this paper; an extension to a multi-authority scenario is conceivable, since servers are also authority independent. Usurping a right with no information at all about other clients is for a client as hard as the discrete logarithm, and rights sharing between clients does not compromise their non-shared rights as long as RSA confidentiality holds. Transferring rights between clients without the authority's contribution cannot be done unless RSA confidentiality is broken; however, only control on partial rights transfers is addressed in this paper, which does not deal with total identity transfer or alienation.