Research On Information Hiding Algorithm Based On Improved Image Encryption

As the rapid development of computer technology and communication technology,multimedia information exchange reached an unprecedented depth,which greatly facilitated people's work and life.Digital image information has gradually become the way of communication between people,However,it brings a great number of information security problems: the release of the work is easy to be forged,tampering caused by infringement,privacy data is leaked or misused.So how to protect the security of digital images effectively,become the people's attention.There are two traditional means of protecting digital image information security,first is encryption technology and another is information hiding technology.However,traditional image information hiding techniques do not apply to permanent distortion of carrier images,particularly in medical images,remote sensing images,military images,and court evidence are particularly sensitive to carrier distortion.Therefore,we need a new way which can both have a hidden role and can avoid vector distortion effectively.Reversible data hiding in encrypted domain technology combines the advantages of original information hiding and encryption technology,and makes up for the lack of original information hiding and encryption algorithm,which is the main direction of domestic and foreign scholars' research.This paper is talking about information hiding algorithm which based on improved image encryption.The main contents are as follows :(1)This dissertation research and analysis on the encryption algorithm and information hiding algorithm and introduce the theory of reversible data hiding in encrypted domain,which lays a theoretical foundation for further research.(2)Propose a new method that is a reversible data hiding algorithm in encrypted domain based on threshold division.The algorithm mainly uses the correlation feature of the boundary pixels of adjacent blocks in the block image,and chooses the appropriate threshold to divide the texture and smooth region of the image.Embedding the contents on the way of the Least Signification Bits to be flipped.and the receiver can extract the hidden data better and restore the original image.Experimental results show that the performance of the proposed algorithm is more excellent,because it can improve the error rate effectively and embed capacity doubled.(3)Based on the above method,an improved encryption method is proposed.The chaotic model is used as the encryption sequence to realize the encryption process.Experimental results show that the proposed algorithm has high security performance,and it is feasible.