In order to solve data security issues in wireless sensor networks

a digital watermarking technique applied to wireless sensor networks was proposed.And the algorithms for watermark generation

embedding and detecting were designed.According to the algorithms

the identity of the sending node was recognized by watermarking information.The watermarking information was embedded into the sent data

and was retained in the process of data aggregation.The receiving node judges the reliability of data by verifying this watermarking information.Once the watermarking information was detected

the data would be stored and transmitted.Otherwise the data would be discarded.Analysis on the security and energy consumption of the algorithms and experimental results show that these algorithms are feasible and practicable.The data reliability can be verified effectively and the watermarking information can not be destroyed in the process of sampling and summarization.