Research On Data Security Of Underwater Sensor Network Based On Digital Watermark

Underwater wireless sensor network(UWSN)is an emerging research field in the whole wireless sensor network(WSN)field.UWSN has been widely used in marine environmental monitoring,marine resource development,marine disaster prevention,auxiliary navigation,military purposes and other fields.The lower sensor network is a network self-organized by a myriad of sensor nodes.The underwater sensor nodes are mainly responsible for collecting various environmental data,and transmitting the data to the base station or the collection center through single-hop or multi-hop,and finally transmitting to the user terminal.Since sensor nodes are usually distributed in unsupervised areas and the underwater environment is complex,UWSN is vulnerable to various threats and attacks,and node-aware data is highly susceptible to tampering and forgery.Therefore,how to ensure the safety of underwater sensor network transmission data has become an important research object in the field of UWSN research.The application of wireless sensor network technology in the underwater field has just begun,and its technology and application are still not very mature.The data security algorithm based on digital watermark is simple in calculation,consumes less resources,and has higher security.It is more and more valued by Chinese and foreign researchers.It is more and more valued by Chinese and foreign researchers.According to the characteristics of UWSN and digital watermarking technology,this paper can guarantee the true and accurate data in a limited environment.The main research contents of this paper are as follows:(1)Review relevant domestic and foreign literature,study various attacks and threats faced by underwater sensor networks,analyze the characteristics of existing defense technologies,and put forward the data security requirements of underwater sensor networks.(2)The characteristics of underwater sensor network channel and digital watermarking characteristics are analyzed.Combined with the characteristics of underwater acoustic channel,a digital watermarking model based on underwater acoustic channel is proposed.Based on the spread spectrum technology,several existing expansions are analyzed.The characteristics of the frequency sequence are proposed as a spread spectrum watermark sequence.Based on these,a digital watermarking scheme suitable for underwater sensor network data security is designed.(3)A method for embedding chaotic spread-spectrum watermarking technology in the redundant space of data to realize data security of underwater sensor networks is proposed.Using the statistical characteristics of chaotic sequences and the combination of spread spectrum techniques,a chaotic spread spectrum watermark is generated,and the watermark information is embedded in the redundant space for acquiring data.At the sink node or base station,the digital watermark detection algorithm is compared to verify whether the carrier data is corrupted during transmission.Simulations verify the effectiveness of the proposed method.(4)In order to improve the robustness and security of watermark,a digital watermarking scheme based on FRFT transform domain is proposed.The chaotic spread-spectrum watermark is used as the watermark information,and the watermark is embedded by changing the singular feature value by using the good time-frequency characteristics of FRFT and the stability of the singular eigenvalue.Experimental simulation shows that the method has good security and transparency,can detect whether the data is attacked,and can verify the integrity of the sensor network data.