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Recently, Eschenauer and Gligor [EG02] proposed a model (The EG-model) for random key pre-distribution in distributed sensor networks (DSN) that allows sensors to establish private shared keys. In this model, each sensor is randomly assigned a set of keys, called a key-ring, from a secret key-pool. Two nodes can communicate securely by using a shared key (Direct key) or via a chain of shared keys (key-path). The authors show how the key-ring size can be chosen so that nodes are guaranteed to be linked either by direct keys or by key-paths. Security of this system is proven for an eavesdropping (Passive) adversary. In this paper the authors assume the same key pre-distribution set-up but consider a semi-honest adversary.
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