The sensors in wireless sensor network (WSN) are vulnerable to malicious attacks due to the transmission nature of wireless media. Secure and authenticated message delivery with low energy consumption is one of the major aims in WSN. The identity-based key authentication scheme is more suitable for the WSN. In this paper, the Hierarchical Matrix Decomposition-based Signcryption (HMDS) algorithm was proposed, which is a kind of identity-based authentication scheme. In HMDS scheme, three-layer architecture, base station (BS), cluster head, and intracluster, is employed to adapt to the common structure of WSN. As the key generation center (KGC), the BS adopts matrix decomposition to generate the identification information and public key for cluster head, which not only reduces the cost of calculation and storage but also avoids the collusion attack. Experiments show that the HMDS algorithm has more advantages over other algorithms and is very suitable for the large-scale WSN.
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