A Generic Transformation from Symmetric to Asymmetric Broadcast Encryption

  • Ulrich Huber
  • Ahmad-Reza Sadeghi
Conference paper

DOI: 10.1007/11836810_20

Part of the Lecture Notes in Computer Science book series (LNCS, volume 4176)
Cite this paper as:
Huber U., Sadeghi AR. (2006) A Generic Transformation from Symmetric to Asymmetric Broadcast Encryption. In: Katsikas S.K., López J., Backes M., Gritzalis S., Preneel B. (eds) Information Security. ISC 2006. Lecture Notes in Computer Science, vol 4176. Springer, Berlin, Heidelberg

Abstract

Broadcast Encryption (BE) schemes allow a sender to efficiently encrypt messages for a large set of receivers. The currently most efficient BE schemes in the stateless receiver scenario are based on symmetric cryptography. However, a variety of business models with mutually mistrusting senders necessitates the use of asymmetric cryptography. We propose a generic framework that allows to transform a large class of symmetric BE schemes into asymmetric schemes, where the transformation employs an arbitrary hierarchical identity based encryption scheme. Applying our framework, we transform a recent symmetric scheme, called layered punctured interval scheme, for which no asymmetric version has yet been published. In addition, we give a formal proof of the chosen ciphertext security of our framework, which allows to generically transform any future symmetric BE scheme within the large class into a chosen-ciphertext-secure asymmetric scheme with the same efficiency measures.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2006

Authors and Affiliations

  • Ulrich Huber
    • 1
  • Ahmad-Reza Sadeghi
    • 1
  1. 1.Horst Görtz Institute for IT SecurityRuhr-Universität BochumGermany

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