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In unattended or hostile environment like battlefield, sensor nodes may be compromised. If one node is compromised, group key which is shared by all the group members should be rekeyed in real-time and the compromised nodes should be revoked as soon as possible. As there is no such node that can always be trusted in sensor network, a distributed group rekeying scheme with speedy compromised node revocation is proposed in this paper. Based on a novelly constructed authentication polynomial, group rekeying is initiated by local network collaboratively in our scheme. Compared with the existing schemes, the proposed scheme can not only rekey in real-time, but reduce more communication overheads and provide a high level of security at the same time.

The first Workshop on advanced EXPerimental activities ON WIRELESS networks and systems (EXPONWIRELESS 2006) brought individuals involved in all the aspects related to experimental achievements on wireless networks. The workshop is the first in a series intended to the creation of a forum where researchers, vendors, providers and users have exchanged ideas on past experience, current requirements, and future visions, useful for the development of new protocols, algorithms, devices and systems. The workshop attracted high interest among the international community, and included the presentation of 10 papers from seven different countries. These proceedings contain the revised versions of the accepted papers. The 15 members of the Technical Program Committee, together with several additional external reviewers, worked hardly for providing the basis for the final paper selection. The final program was excellent and diverse, and covered fundamental issues in wireless measurements in operating and test-bed network scenarios, experimental analysis of wireless sensor networks, of protocols for fast handoff and for multicast services. The final result would not have been possible without the dedication and hard work of many colleagues. Special thanks are due to the members of the Technical Program Committee and to all external referees for their invaluable help with the paper reviews and their overall sense of responsibility and responsiveness under very tight deadlines in a particularly busy period. Finally, we are very grateful to all authors who honoured EXPONWIRELESS 2006 by trusting their work to the workshop.

Virtual enterprises are now viewed as of the most promising strategy for future manufacturing enterprises. However, decision and control processes within this domain have not received deserved attention till now. Based on agent technology, this paper discusses an architecture for control and decision-making during the dynamic creation and operation of a virtual enterprise. An approach for integrating different business units is presented. Prototype software simulating the design of a new product in a virtual enterprise is developed.