Research And Design Of Encrypted Image Reversible Watermarking Algorithm

With the rapid development of cloud technology and big data,digital forms have gradually become the main forms of content in traditional media.It is precisely because of the changes in the main content forms of traditional media that some multimedia data(images,audios,videos,texts,etc.)are stored and disseminated Becoming more convenient,along with the convenience,it also makes it easier for privacy leaks,copyright infringements and other illegal and criminal activities.Failure to better guarantee the integrity and effectiveness of digital works seriously damages the interests of the owners of the works.This shows that it is extremely important to solve copyright protection and privacy security issues.As a relatively intuitive information carrier,digital images are part of the information source and can be used as the carrier of digital information.The most widely used method of secure transmission is to encrypt the digital image before transmission,so that the security of the data to be transmitted is effectively guaranteed.Encrypted image reversible watermarking technology is an emerging technology that uses encrypted images as a carrier and hides the watermark information on the encrypted image,while simultaneously extracting the original watermark information and restoring the original carrier image.This technology guarantees the security of digital image content.In this paper,the current encryption domain image reversible watermark hiding algorithm has a small amount of embedded watermark information,complex embedding methods,low image encryption security,and low quality of watermarked images.The main work is as follows:1.Aiming at the problem of low security of traditional encrypted image reversible watermarking algorithm in the image encryption stage,the national secret algorithm ZUC algorithm is combined with the encrypted image reversible watermarking algorithm,and a reversible watermarking algorithm based on ZUC encrypted image is proposed.ZUC is used to encrypt the image in the encryption stage.It can effectively improve the security of the algorithm.At the same time,the pixel correlation combined with the LSB watermark algorithm is used to realize the reversibility of the algorithm,which greatly reduces the complexity of the algorithm.2.In some special fields such as medicine and military,there are high requirements for the quality of the decrypted image of watermarked information.However,the general reversible watermarking algorithm for encrypted images cannot guarantee the quality of the information-containing image.Aiming at this point,a reversible encrypted image based on ZUC is proposed.The separability of the watermark algorithm further improves the security of the algorithm.In addition,the principle of watermark extraction and image restoration is based on the use of the correlation of adjacent pixels,and is realized through an improved adaptive difference algorithm,which improves the recovery.The quality of the carrier image and the directly decrypted image.3.In view of the low embedding rate of the traditional encrypted image reversible watermarking algorithm,the image interpolation watermarking algorithm is combined with the encrypted image reversible watermarking algorithm,and a reversible watermarking algorithm based on the ZUC separable encrypted image interpolation space is proposed.First,the ZUC algorithm is used to generate the encrypted secret.Key,use the generated key to encrypt the plaintext image,and then calculates the size of the interpolation interval,so that the number of embedding bits can be obtained,and the desired interpolation is the target.The final interpolation is determined by the difference correction factor and the watermark information.It can achieve the effect of reducing the error and make the final interpolation as close as possible to the expected interpolation.The algorithm also guarantees the embedding rate and the quality of the watermarked image.