Untransferable Rights in a Client-Independent Server Environment

A scheme for ensuring access rights untransferability in a client-serverecenario with a central authority and where servers hold no access information about clients is presented in this paper; an extension to a multi-authorityscenario is conceivable,sinceservers are also authority independent.Usurping a right with no informationat all about other clients isfor a client as hard as the discretelogarithm, and rights sharing between clients does not compromisetheir non-shared rights aa long as MA confidentiality holds. Transferring rights between clients without the authority's contribution cannot be done unless M A confidentiality is broken; however, only controlon partialrights transfers is addressed in this paper, which does not deal with totalidentitytransfer or alienation.

• Type: Conference
• Year: 1993
• Where: EUROCRYPT
• Authors: Josep Domingo-Ferrer
• Keywords: Access Rights Untransferability, Central Authority, Cryptology, EUROCRYPT 1993, Non-shared Rights Aa