A new cramer-shoup like methodology for group based provably secure encryption schemes

  • Authors:
  • María Isabel González Vasco;Consuelo Martínez;Rainer Steinwandt;Jorge L. Villar

  • Affiliations:
  • Área de Matemática Aplicada, Universidad Rey Juan Carlos, Madrid, Spain;Departamento de Matemáticas, Universidad de Oviedo, Oviedo, Spain;IAKS, Arbeitsgruppe Systemsicherheit Prof. Beth, Fakultät für Informatik, Universität Karlsruhe, Karlsruhe, Germany;Departamento de Matemática Aplicada IV, Universitat Politécnica de Catalunya, Barcelona, Spain

  • Venue:
  • TCC'05 Proceedings of the Second international conference on Theory of Cryptography
  • Year:
  • 2005

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Abstract

A theoretical framework for the design of—in the sense of IND-CCA—provably secure public key cryptosystems taking non-abelian groups as a base is given. Our construction is inspired by Cramer and Shoup's general framework for developing secure encryption schemes from certain language membership problems; thus all our proofs are in the standard model, without any idealization assumptions. The skeleton we present is conceived as a guiding tool towards the construction of secure concrete schemes from finite non-abelian groups (although it is possible to use it also in conjunction with finite abelian groups).