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Group Key Management

This project has completed.

Principal investigator: Professor Nahid Shahmehri
Members: Dr. Claudiu Duma (former member)
Lin Han (former member)
Funding agency:
Related projects: Secure e-service software delivery
Keywords: security, group key management, pki, multicast


In this project we studied tradeoffs between efficiency and security in group key management for multicast communication. Efficiency is judged in terms of group rekeying and key storage cost; security is judged in terms of backward secrecy, forward secrecy and resistance to collusion. Group key management schemes that support fine-tuning the tradeoff between security and efficiency can be used in a wide range of applications, and have the ability to adapt to e.g. changes in number of peers or security requirements.


  • C. Duma, N. Shahmehri, P. Lambrix, "Efficient Storage for Category-Based Group Key Management". 5th Conference on Computer Science and Systems Engineering in Linköping, pp 139-146, Norrköping, Sweden, October 2004.
  • C. Duma, Security and Efficiency Tradeoffs in Multicast Group Key Management, Licentiate thesis no. 1054, Linköpings universitet, Sweden, ISBN 91-7373-770-4, November 2003.
  • Duma C., Shahmehri N. and Lambrix P., `A Hybrid Key Tree Scheme for Multicast to Balance Security and Efficiency Requirements', Proceedings of the IEEE WETICE Workshop on Enterprise Security, pp 208-213, Linz, Austria, 2003.
  • Duma C., Shahmehri N. and Lambrix P., 'A Flexible Category-Based Collusion-Resistant Key Management Scheme for Multicast'. Proceedings of the 18th IFIP International Information Security Conference , pp 133-144, Athens, Greece, May 2003.

Page responsible: Nahid Shahmehri
Last updated: 2009-08-24