Joint compression-encryption of block image based on context
Guan Lina, Jiaxian Deng · Jisuanji yingyong yanjiu · 2013
This paper proposed a novel algorithm,in which the data of block regions mapped to the corresponding sub-band coefficients in order to make the image compression and encryption realized simultaneously and improve security.It used the key to modify the original context.And then it sent the modified context and the corresponding decision to arithmetic coder to implement the joint compression-encryption.The security encryption by the adaptive arithmetic coding is better than the one by arithmetic coding based on interval splitting(ACIP).The distribution of the adaptive arithmetic coding is more complex than the probability distribution of ACIP which is fixed.It simulated the proposed algorithm.The results show that the scheme has the same compression efficiency compared with the original image compression algorithm.The relative quality of different regions can be controlled flexibly.It can have a better information security efficiency to use the way of image block.Different keys can be used to encrypt the coefficients of different regions,which can realize the important information privacy and confidentiality protection.