Extended Notions of Security for Multicast Public Key Cryptosystems

  • Authors:
  • Olivier Baudron;David Pointcheval;Jacques Stern

  • Affiliations:
  • -;-;-

  • Venue:
  • ICALP '00 Proceedings of the 27th International Colloquium on Automata, Languages and Programming
  • Year:
  • 2000

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Abstract

In this paper we introduce two notions of security: multi-user indistinguishability and multi-user non-malleability. We believe that they encompass the correct requirements for public key encryption schemes in the context of multicast communications. A precise and non-trivial analysis proves that they are equivalent to the former single-user notions, provided the number of participants is polynomial. We also introduce a new definition for non-malleability which is simpler than those currently in use. We believe that our results are of practical significance: especially they support the use of PKCS#1 v.2 based on OAEP in the multicast setting.