Abstract: In order to meet the requirement of the digital image business model of try with option to buy,we proposed an artificial image security degradation algorithm based on invertible information hiding in spatial domain.The algorithm uses histogram shifting method of lossless hiding to embed the compensation matrix for recovering the original image precisely.By controlling the embedding depth,the algorithm can generate publishing image which has large distortion but also keeps the main information of the original image.The scrambling and encryption methods are used in the algorithm so that the invaders can not recover the original image correctly by brute-force method without authorized files.The experiment results demonstrate that the algorithm can not only obtain the publishing image which has big differences with the original one,but also recover the exact image when security permission is released.

Key words: Image artificial degradation,Lossless hiding,Control factor,Histogram shifting,Authorized files