An Authentication Method for Self Nodes Based on Watermarking in Wireless Sensor Networks

In order to solve data security issues in wireless sensor networks, an authentication method for self nodes based on digital watermarking technique for wireless sensor networks was proposed. The algorithms for identity generation, embedding and detecting were designed. According to the authentication model proposed, the identity of sending node was generated by transforming a key and the data collection time. The transforming result formed the watermark, which was embedded into the sending data. The receiving node judges the authenticity of the data by verifying this watermark. Once the watermark was detected, the data would be stored and transmitted. Otherwise the data would be discarded. Analysis for the security and energy consumption of the algorithms and experimental results show that these algorithms are effective and practicable. The authentication algorithms are also robust enough to resist the process of aggregations such as sampling and summarization.