Partial reversible AMBTC-based secret image sharing with steganography

Abstract

Existing secret image sharing (SIS) schemes with steganography and authentication are designed for uncompressed images. They cannot be applied to compressed domain. When the cover image is of significance, these schemes cannot revert the distorted stego image into its original form. To solve these problems, a (k,n) threshold partial reversible absolute moment block truncation coding (AMBTC) based SIS scheme with steganography and authentication is proposed. A secret image is split into n noise-like shares by employing the polynomial based SIS under GF(28). To efficiently manage the shares, they are concealed into the AMBTC cover image with parity bits by the proposed embedding algorithms, and n meaningful stego images are constructed. Authentication is adopted so that the integrity of stego image can be verified. Sufficient stego images can perfectly reconstruct the secret. Meanwhile, the original AMBTC cover image can be partially recovered with high probability. Theoretical analysis and experimental results are demonstrated, showing the effectiveness and advantages of the proposed scheme.