In this paper, we present a scalable and secure protocol for key revocation in Wireless Sensor Networks. The protocol guarantees an authenticated distribution of new keys that is efficient in terms of storage, communication and computing overhead. The proposed protocol reduces the number and the size of rekeying messages. It achieves the necessary level of confidentiality and authenticity of rekeying messages by only using symmetric ciphers and one-way functions. Hence, the protocol results scalable, and particularly attractive for large and/or highly dynamic groups.
Nowadays, small, low-cost sensor nodes are being widely used to build self-organizing, large-scale, wireless networks for various applications, such as environmental surveillance, health monitoring and so on. Given its unique features, protecting a wireless sensor network is a difficult challenge. In this paper, we present S2RP, a secure and scalable rekeying protocol for sensor networks. S2RP aims at a trade-off between security and resource consumption while it guarantees an authentic distribution of keys that preserves both forward and backward security. The proposed protocol is efficient in terms of communication overhead as it reduces the number and the size of rekeying messages. It is efficient in terms of computation overhead as it guarantees the necessary level of confidentiality and authenticity of rekeying messages by only using symmetric ciphers and one-way hash functions. It follows that S2RP meets the reduced capabilities of sensor nodes, results scalable, and particularly attractive for large and/or highly dynamic group
Abstract. In a Wireless Sensor Network, sensor nodes may fail for several reasons and the network may split into two or more disconnected partitions. This may deteriorate or even nullify the usefulness and effectiveness of the network. Therefore, repairing partitions is a priority. In this paper we present a method to repair network partitions by using mobile nodes. By reasoning upon the degree of connectivity with neighbours, a mobile node finds the proper position where to stop in order to re-establish connectivity. Factors influencing the method performance are singled out and criteria for their selection are discussed. Simulations show that the proposed method is effective and efficient notwithstanding packet loss.
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