Research On Watermarking And Encryption In Document Image Based On Multiple Biometrics

With the rapid development of computer network and information technology,the development of office automation and e-commerce has been accelerated.A large number of digital information such as videos,images,emails and documents have been transmitted through the Internet.However,the problems of illegal infringement and copyright protection have become increasingly prominent.Therefore,digital watermarking technology has received widespread atten tion and research.The realization of digital watermarking in multimedia data mainly depends on the existence of a large amount of redundant information in such multimedia data.The data redundancy of electronic document images is very limited compared with other multimedia data,therefore,the development of text-based Digital watermarking technology is more limited,there is low embedded capacity,poor robustness and other issues.According to the existing problems of digital image watermarking in electro nic documents,this paper presents an improved solution.By analyzing the pixel values of 8-bit grayscale images of electronic documents,a large number of white pixels are selected as the new cover images,and the watermark images are embedded in it using discrete wavelet transform and singular value decomposition,the newly embedded watermarked image is restored to the original electronic document by way of pixel location recovery.In order to achieve effective copyright protection and infringement tracking,the watermark image embedded in cover adopts the biometrics images of the copyright owner's palm or face.Experimental data show that the improved algorithm improves the embedding capacity and improves the robustness.This paper also proposes a digital watermarking technology based on multiple biometrics,which can embed multiple biometrics images as watermarking information to protect the copyright.For individuals,the biological characteristics of many different parts can further ensure the safety of certification.Contracts and other documents that require two or even three parties involved in the personal information of multiple parties,and multi-biometric watermark embedding also solve the problem of multi-certification,so the algorithm for a multi-party involved in copyright tracking and identity authentication provides a great help.In order to further ensure the security of the electronic document image during transmission,an image encryption algorithm is proposed in this paper,which encrypts the watermarked image.The algorithm uses Logistic chaos map and DNA sequence to scramble the pixel position of the image and perturb the pixel value,and then uses the three-dimensional Lorenz chaotic system to fuse the pixel value to generate the encrypted image.In the algorithm proposed in this paper,using the pixel value of the watermark image as the key component makes the algorithm have better cryptographic performance.The simulation and security analysis of this algorithm show that the proposed algorithm has better encryption performance,large key space and high sensitivity,which can resist exhaustive attacks and statistical attacks.