Policy-based management enables flexible adaptive behaviour by supporting dynamic loading, enabling and disabling of policies without shutting down nodes. This overcomes many of the limitations of sensor node operating systems, such as TinyOS, which do not support dynamic modification of code. This paper presents the design, implementation and evaluation of an efficient policy system called Finger supports both event condition action rules which provide a simple means to 'program' adaptive

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... iour and authorisation policies to protect node services and resources from external access. The system performance in terms of processing latency and resource usage is evaluated.