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Figure 1(a) shows the relationship between p and the combinations of s and s . It is easy to see that the closer s and s are, the more likely two sensor nodes can establish a direct key. 4) shows that small s and s can provide high-security performance. This differs from the basic probabilistic scheme [Eschenauer and Gligor 2002] and the qcomposite scheme [Chan et al. 2003], where the key pool size has to be very large to meet certain security requirement. , the degree t of the polynomials) that affects the security performance of the random subset assignment scheme.

1, February 2005. 48 • D. Liu et al. other directly. In this paper, we assume that they can always discover a route between themselves so that the messages from one node can reach the other. The main issue in this phase is the path discovery problem, which specifies how to find a path between two sensor nodes. Similar to phase 2, there are two types of techniques to address this problem. 1 Predistribution. Similar to the predistribution technique in phase 2, the setup server predistributes certain information to each sensor node so that given the ID of another node, each node can determine at least one key path to the other node directly.

The analysis shows that both schemes have a number of nice properties, including high probability, or guarantee to establish pairwise keys, tolerance of node captures, and low storage, communication, and computation overhead. To further reduce the computation at sensor nodes, this paper presents an optimization technique for polynomial evaluation, which is used to compute pairwise keys. This paper also reports the implementation and the performance of the proposed schemes on MICA2 motes running TinyOS, an operating system for networked sensors.

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ACM transactions on information and systems security (February) by D. R. Kuhn on corporate internet, B. Bertino on authorization constraints, V. Bhamidipati and others M. Nyanchama and S. Osborn on the role graph model, Ravi Sandhu

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