Secure decentralized data transfer against node capture attacks for wireless sensor networks

In wireless sensor networks, sensor nodes have limited computational power and memory size. The data is vulnerable to attack due to the nature of the systems, so maintaining confidentiality is an important problem. Most security methods are based on common or public key cryptosystems. However, these methods have problems with encryption of data. When nodes try to encrypt data, they must preestablish keys. When nodes send data to the sink node, all of the exchanged information will concentrate in the sink node. This creates a single point of failure. In this paper, we propose a new distribution method resilient against node capture attacks using the secret sharing scheme. In addition, we will confirm the ability of our method to improve resiliency against node capture attacks, comparing it with TinySec, which is the major security architecture of wireless sensor networks. Also, we compare the resiliency to existing pairwise key establishment methods.