Computationally secure secret image sharing

A secret image sharing scheme is used to protect the confidentiality of important images and also to safeguard them against single point of failure. the first proposed secret image sharing scheme used a technique to reduce the size of shares to 1/t of the secret, the benefits of small share size drawn the attention of many researchers to that technique and it was used in many of the later studies. In this paper we first show that this technique has some serious security weaknesses, then in order to overcome these drawbacks and achieve computational security, we use All-or-Nothing transformation before share generation process. Also, we use an Information Dispersal Algorithm instead of a secret sharing algorithm which results in better performance in share generation and secret reconstruction. In this way, our proposed secret image sharing scheme enjoys better performance, computational security and small share size. Experimental results confirm the efficiency of the proposed scheme.