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SUMMARYMany applications of wireless sensor network (WSN) require secure data communications, especially in a hostile environment. In order to protect the sensitive data and the sensor readings, secret keys should be used to encrypt the exchanged messages between communicating nodes. Traditional asymmetric key cryptosystems are infeasible in WSNs due to the extremely low capacity and constrained resources at each senor node. Recently proposed protocols are either vulnerable to the large-scale node capture attacks or lack of performance scalability in terms of storage, communication and computation costs. To address these limitations, we study the key pre-distribution schemes in this paper and propose a new one with all of the following properties which are particularly beneficial to the large-scale resource-constrained WSNs: (1) it completely defends against the node capture attacks, (2) it provides full connectivity of the network, and (3) it reduces the storage and communication overhead significantly compared with the other proposals.

SUMMARYMany applications of wireless sensor networks (WSNs) require secure group communications. The WSNs are normally operated in unattended, harsh, or hostile environment. The adversaries may easily compromise some sensor nodes and abuse their shared keys to inject false sensing reports or modify the reports sent by other nodes. Once a malicious node is detected, the group key should be renewed immediately for the network security. Some strategies have been proposed to develop the group rekeying protocol, but most of existing schemes are not suitable for sensor networks due to their high overhead and poor scalability. In this paper, we propose a new group rekeying protocol for hierarchical WSNs with renewable network devices. Compared with existing schemes, our rekeying method possesses the following features that are particularly beneficial to the resource-constrained large-scale WSNs: (1) robustness to the node capture attack, (2) reactive rekeying capability to malicious nodes, and (3) low communication and storage overhead. key words: key management, group rekeying, hierarchical wireless sensor network, security

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