Research On Cognitive Wireless Network Image Encryption And Digital Watermarking Technology

Computer network is changing people's production and life,but the network security issues such as data and user information leakage have become increasingly prominent.Information encryption technology is an important way to improve the security of information.Cognitive radio network is considered as the core technology of the next generation wireless communication and network.It is the best way to realize the heterogeneous integration of wireless network and efficient use of network resources to meet customer end to end service requirements.Image encryption technology is a kind of technology that uses the characteristic of the digital image to design the encryption algorithm,in order to improve the security and efficiency of encryption.Digital watermarking is an important branch and research direction in the field of information hiding technology.It can be identified directly or indirectly embedded digital carrier.It is hard to be detected and modified.It also does not affect the original vector value.The main work of this paper is to study the information security encryption technology,and explore the application of wireless cognitive network environment,mainly divided into image encryption and digital watermarking.The image encryption part includes spatial image encryption and frequency domain image encryption,digital watermarking includes digital image watermark generation,embedding and detection.Among them,the encryption algorithm is the key to enhance the effectiveness of information security protection.First,in the process of image encryption,this paper introduces the chaos encryption algorithm,the wavelet encryption algorithm,and realizes digital image encryption in the practical application.Then,in the part of digital watermarking,this paper introduces some concepts and basic models of digital watermarking,and improves and applies the robust digital image watermarking technology.In the last part of the wireless cognitive network environment,this paper introduces the characteristics and the security protection content of the wireless cognitive network,and expounds and studies the problem of the authentication of the user's legitimacy.In this paper,the application of image encryption and digital watermarking technology in cognitive wireless network environment is studied,and the specific innovative research results are mainly embodied in the following aspects:(1)Based on the image space domain and frequency domain encryption algorithm,this paper proposed an image encryption algorithm,which mixed with chaotic encryption and wavelet transform.The algorithm has a greater security to achieve image scrambling and compression.(2)Based on the research of digital watermarking common technology,this paper proposes a combination of digital watermarking technology and image encryption technology.Firstly,the embedded object is encrypted to get the cipher text,and then the cipher text is hidden into the carrier through the digital watermark.(3)In cognitive radio networks,when main user base station using algorithm to carry out user authorization,it can use the image encryption and digital watermarking hidden objects for communication,which provides a new way for the legitimate user authentication.At the end of this paper,it analyzes the problems of the information encryption in the cognitive radio network,and puts forward the direction of further exploration and research.