Smart applications for energy harvested WSNs
COMSNETS'10 Proceedings of the 2nd international conference on COMmunication systems and NETworks
Energy efficiency of encryption schemes applied to wireless sensor networks
Security and Communication Networks
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Information security is an essential consideration of any distributed network. However, security primitives that provide encryption and authentication are not always suitable for resource-constrained devices, such as the nodes on a wireless sensor network. Here we present a specification for a symmetric cipher especially designed for a wireless sensor network. We build upon the work of Dawson et. al [3] in their general purpose cipher Dragon and on Lim et al. [6] who provided a Dragon-based authentication component for wireless sensor networks. Dragon's internal state is quite large and unsuitable for constrained devices, and the authentication component works only for very short messages. We present Tiny Dragon, a cipher that uses an 80-bit key in conjunction with a 34-byte state to provide joint encryption and authentication for messages of any length. Compared to Dragon, Tiny Dragon has a greatly reduced implementation footprint, improved per-bit security and is more suitable for deployment in hardware and software. We provide a short security analysis to provide confidence in the algorithm.