Universally composable adaptive oblivious transfer (with access control) from standard assumptions

  • Authors:
  • Masayuki Abe;Jan Camenisch;Maria Dubovitskaya;Ryo Nishimaki

  • Affiliations:
  • NTT Secure Platform Laboratories, Tokyo, Japan;IBM Research - Zurich, Rüschlikon, Switzerland;IBM Research - Zurich, Rüschlikon, Switzerland;NTT Secure Platform Laboratories, Tokyo, Japan

  • Venue:
  • Proceedings of the 2013 ACM workshop on Digital identity management
  • Year:
  • 2013

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Abstract

In this paper, we provide the first scheme that realises an attribute-based access control system for static resources that offers maximal privacy and is secure in the universal composability framework (UC). More precisely, we offer a protocol for adaptive oblivious transfer, where the sender can enforce an attribute-based access control policy for each record and nevertheless learns neither which record a user retrieves nor which attributes a user has. As additional results we provide a new structure-preserving signature scheme from the SXDH assumption and a new universally composable adaptive oblivious transfer protocol that is secure under two DDH-like assumptions and is the most efficient one secure under ``non $q$-type'' assumptions. We believe the new signature scheme to be of independent interest as a building block that is compatible with Groth-Sahai non-interactive zero-knowledge proofs.