By Dominique GaÃ¯ti
This quantity includes the court cases of the Fourth IFIP overseas convention on community keep an eye on and Engineering for QoS, defense and Mobility, NETCON 2005. The convention, prepared via the foreign Federation for info Processing, was once held in Lannion, France from November 14-18, 2005. insurance explores community defense, community coverage, caliber of carrier, instant networks, clever networks, and function review.
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Extra info for Network Control and Engineering for QoS, Security and Mobility, IV: Fourth IFIP International Conference on Network Control and Engineering for QoS, Security ... Federation for Information Processing)
We showed in the paper that a simple straightforward distribution approach is more efficient for small groups than a key tree based one. It provides a stable performance and needs less effort for its maintenance. Key tree based schemes like TGDH and the Rodeh protocol possess a fluctuating performance after many rekeying operations due to the unbalance of the key tree. To maintain a balanced key tree rebalance algorithms have to be applied which makes the protocols more complex and less practical.
And TGDH which are considered the most efficient group key distribution and agreement protocol, respectively. For the comparison, we apply the benchmarks of cryptographic algorithms from  to calculate the performance. The benchmarks are summarized in Appendix. TKD comprises two different procedures: member authentication (message MjiMu) and group key renewal (message Mjs or MLI). Since the other two protocols do not possess a member authentication we only compare the cost for the key renewal.
System architecture The application layer is not further specified here. We assume that it contains the control modules of the given application such as QoS management or floor control modules. The security layer consists of two parts: the encryption/decryption module for data and media exchange, and the TKD protocol which distributes the group key used in the encryption/decryption function and authenticates joining members. The security 32 Fuwen Liu, Hartmut Koenig layer is closely connected with the group communication layer which assures the consistency of the group data.