Research And Design On Secret Image Sharing Scheme

Secret sharing is an important embranchment of modern cryptography. While, secret image sharing is the extension of secret sharing to image. The images' integrality and security can be achieved using this sharing technique. Presently, there are some kinds of secret image sharing schemes had been constructed. But they are not good enough for the requirement such as in the recovering image's quality, the data amount during the secret sharing process and security of images'transmission in the internet etc.Firstly, this paper analyzes and summarizes various secret image sharing schemes of the domestic and international at present, then introduces the basic theory and application of secret image sharing scheme. According to the question of excessive data amount during the secret sharing process, a compressible (r,n) threshold secret image sharing scheme is proposed which based on Shamir's threshold secret scheme. According to the question of the recovering image's quality, a lossless and compressible (r,n) threshold secret image sharing scheme is also designed. Subsequently, it also gives out the experiment results and the analysis to the scheme's security. According to the experimental results, it gives out the security and performance of scheme. A method for access structure is also constructed by the scheme.Secondly, a general (r,n) threshold secret image that sharing scheme is designed which can share multi secret. It gives out the experiment results and the analysis to the scheme's security through experimentalizing.Thirdly, in order to improve the security of images'transmission in the internet, a threshold secret image sharing scheme which based on improved LSB information hiding technology is designed. Subsequently, the distributing and recovering steps of the scheme have been described in detail.Based on theproposed scheme, the corresponding extension how to realize the shadow images'authentication is presented.At last, a threshold secret image sharing scheme based on improved LSB information hiding technology which has small size cover image is constructed. At the same time, the scheme induces a confusion arithmetic which can strengthen the securtity. It also gives out the experiment results and the analysis to the scheme's security.