Key Management Schemes for Peer-to-Peer Multimedia Streaming Overlay Networks

Authors:
J. A. Naranjo;J. A. López-Ramos;L. G. Casado
Affiliations:
Dpto. de Arquitectura de Computadores y Electrónica, Universidad de Almería, Spain;Dpto. de Álgebra y Análisis Matemático, Universidad de Almería, Spain;Dpto. de Arquitectura de Computadores y Electrónica, Universidad de Almería, Spain
Venue:
WISTP '09 Proceedings of the 3rd IFIP WG 11.2 International Workshop on Information Security Theory and Practice. Smart Devices, Pervasive Systems, and Ubiquitous Networks
Year:
2009

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Abstract

Key distribution for multimedia live streaming peer-to-peer overlay networks is a field still in its childhood stage. A scheme designed for networks of this kind must seek security and efficiency while keeping in mind the following restrictions: limited bandwidth, continuous playing, great audience size and clients churn. This paper introduces two novel schemes that allow a trade-off between security and efficiency by allowing to dynamically vary the number of levels used in the key hierarchy. These changes are motivated by great variations in audience size, and initiated by decision of the Key Server. Additionally, a comparative study of both is presented, focusing on security and audience size. Results show that larger key hierarchies can supply bigger audiences, but offer less security against statistical attacks. The opposite happens for shorter key hierarchies.