Secure network coding for multi-resolution wireless video streaming

  • Authors:
  • Luísa Lima;Steluta Gheorghiu;João Barros;Muriel Médard;Alberto Lopez Toledo

  • Affiliations:
  • Instituto de Telecomunicações and the Department of Computer Science, Faculdade de Ciências da Universidade do Porto, Portugal;Telefonica Research, Barcelona, Spain;Instituto de Telecomunicações and the Departamento de Engenharia Electrotécnica e de Computadores, Faculdade de Engenharia da Universidade do Porto, Portugal;Research Laboratory of Electronics at the Massachusetts Institute of Technology;Telefonica Research, Barcelona, Spain

  • Venue:
  • IEEE Journal on Selected Areas in Communications
  • Year:
  • 2010

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Abstract

Emerging practical schemes indicate that algebraic mixing of different packets by means of random linear network coding can increase the throughput and robustness of streaming services over wireless networks. However, concerns with the security of wireless video, in particular when only some of the users are entitled to the highest quality, have uncovered the need for a network coding scheme capable of ensuring different levels of confidentiality under stringent complexity requirements. We show that the triple goal of hierarchical fidelity levels, robustness against wireless packet loss and efficient security can be achieved by exploiting the algebraic structure of network coding. The key idea is to limit the encryption operations to a critical set of network coding coefficients in combination with multi-resolution video coding. Our contributions include an information-theoretic security analysis of the proposed scheme, a basic system architecture for hierarchical wireless video with network coding and simulation results.