Research On Realization And Application Of Vector Map Vulnerable Watermarking Algorithm Against Collusion Attack

At present,geographic information systems(Geographical Information Systems,GIS)are widely used,making great contributions in the fields of traffic navigation,geographic information retrieval,and agriculture and forestry resource management.As the basic data of GIS,vector geographic data has great economic value.Once tampered,it will cause major losses to the owners and users of the information data.The fragile watermarking technology has unique advantages in image authentication.The application of fragile watermarking technology to solve the security problem of vector geographic data is a current emerging research hotspot.Collusion attack is a common method of fragile watermark attack,which is extremely harmful.In order to achieve the purpose of using fragile watermarking technology to protect vector geographic data,it is necessary to design a fragile watermarking algorithm that is practical,easy to operate and can resist collusion attacks.The thesis researches and analyzes the technical requirements and technical characteristics of various fragile watermarking algorithms and the application of fragile watermarking algorithms in vector geographic data.Aiming at the reason why the collusion attack can be successful,a solution to the collusion attack is proposed,which solves the key technical problem of the collusion attack resistance in the fragile watermark algorithm of geospatial vector data.First,the authentication watermark is generated according to the image content;then,the watermark information is embedded after the replacement of the Latin square matrix;finally,the solution is applied to the vector geographic data fragile watermarking algorithm to improve the existing algorithm.The algorithm proposed in the dissertation improves the security of geospatial vector data authentication,and is of great significance to the integrity and authenticity authentication of vector geographic data.This dissertation uses real vector geographic data to verify the improved algorithm and analyze its application.The experimental results show that the improved algorithm can resist collusion attacks and can realize the function of tampering positioning,does not affect the use value of vector maps and runs faster,so it has good practicability in real applications.