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Network Processing Nodes Heterogeneous Mix of Endsystems and Network Processing Nodes Network of Endsystems and

Wireless networks have become the critical infrastructure that enables such applications as sensor networks, mobile personal computing devices, and avionics communication systems. As such, the security of these wireless networks has become an important research issue. Recent literature on wireless network security has focused on traditional security issues, such as encryption and authentication. Less attention has been paid to protecting the quality of service (QoS) assurances that guarantee that critical and important traffic will be routed preferentially through the network. In research that has studied QoS in the face of adversarial attacks, only specific layers of the network protocol stack have been evaluated. In this paper we argue that an integrated architecture for in-network protection of QoS assurances for each individual network traffic flow is essential to wireless network security. This paper makes two main contributions to research on security for wireless networks. First, this paper describes an integrated architecture for in-network nodes designed to protect the specified QoS for each traffic flow traversing a node. The system offers efficient enforcement of high-level policies for allocation of available resources, which allows the network to protect itself both from accidental misuse by its own participants, as well as from malicious attacks. Second, this paper describes our progress toward an implementation of the proposed integrated architecture. We have utilized reconfigurable hardware to implement a packet scheduler that (1) provides hard guarantees on a node’s traffic throughput, (2) can scale throughput seamlessly between very low and very high bandwidth wireless links, (3) is highly flexible in policy without additional overhead and (4) is more efficient in both computational complexity and power consumption than a software implementation of the same capabilities. We have also developed interfaces between the packet scheduler and a proposed middleware framework for negotiation of bandwidth between network services in a way that both enforces highlevel policies effectively and decouples the implementation of the hardware packet scheduler from the services it supports.