An hybrid approach for efficient multicast stream authentication over unsecured channels

  • Authors:
  • Christophe Tartary;Huaxiong Wang;Josef Pieprzyk

  • Affiliations:
  • Division of Mathematical Sciences, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore and Institute for Theoretical Computer Science, Tsinghua University, Be ...;Division of Mathematical Sciences, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore and Centre for Advanced Computing - Algorithms and Cryptography, Depart ...;Centre for Advanced Computing - Algorithms and Cryptography, Department of Computing, Macquarie University, NSW, Australia

  • Venue:
  • ProvSec'07 Proceedings of the 1st international conference on Provable security
  • Year:
  • 2007

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Abstract

We study the multicast stream authentication problem when an opponent can drop, reorder and inject data packets into the communication channel. In this context, bandwidth limitation and fast authentication are the core concerns. Therefore any authentication scheme is to reduce as much as possible the packet overhead and the time spent at the receiver to check the authenticity of collected elements. Recently, Tartary and Wang developed a provably secure protocol with small packet overhead and a reduced number of signature verifications to be performed at the receiver. In this paper, we propose an hybrid scheme based on Tartary and Wang's approach and Merkle hash trees. Our construction will exhibit a smaller overhead and a much faster processing at the receiver making it even more suitable for multicast than the earlier approach. As Tartary and Wang's protocol, our construction is provably secure and allows the total recovery of the data stream despite erasures and injections occurred during transmission.