Data Security Protection Based On Digital Watermark In Wireless Sensor Networks

WSN(Wireless Sensor Network) is a self-organized system based on mission driver, which imperatively focuses on user requests and performs data transmission by middle node. Due to expose to outside zones, vicious attacks will always exist which will change information to the most extent, and it brings users to the wrong side of awareness. Therefore, network data security becomes pretty challenging. The top priority of WSN is to guarantee credibility and security of data. This paper main points are as follows.1. This paper presents a data security protection algorithm which based on digital watermark in WSN. Source nodes will use hash function to calculate out digital watermarking information of sensor data in the first place. Then according to pre-stored keys and processing blocks, the hash function carries out digital watermark storage location that related to targeted blocks. Base station receives data,and extracts digital watermark information embedded in every processing blocks respectively. Meanwhile,compared with re-calculated watermark information, if they are the same with each other, data are intact,otherwise raw data are damaged.2. This paper presents a data protection algorithm based on check code in WSN. Not only can it accurately provide complete data through digital watermark, but also will use check numbers to verify data credibility under the standards of actual credit ratings in data. Source nodes collect data, and check them with reservation signature data. Furthermore, data importance worked out,at the same time, the algorithm can turns out check numbers. Finally, combining with these numbers, hash function generates watermark information, and embeds them with check numbers into data before sending. By separation algorithm, base station will capture relative data from data already received, if watermark verification make no difference, data are trustworthy. Otherwise data credibility needs to be checked by credit algorithm. If credits are better than threshold of credit value set before, data can be recovered, if not, data are abandoned.3.Setting up OMNet++ simulation platform. Drawing experiment results with other classical algorithms, the two algorithms above before both are tolerable to multi-network attacks, successfully protect data security in wireless sensor network. WSDP is suitable to the large amount of data, low energy consumption of the network environment. DPACC is better to the network model which has data prominent feature and high safety.