A Verifiable and Recoverable Secret Image Sharing Mechanism

Verifiability is essential for a secret sharing approach which allows the involved participants to detect cheaters during the secret retrieval process. In this article, we propose a verifiable secret image sharing scheme that can not only resist dishonest participants but can also satisfy the requirements of loss less and camouflage. The new approach conceals the shadows into a pixel pair of the host image by adding or subtracting a pixel value by 1. Consequently, the embedding alteration can be reduced to preserve the fidelity of the shadow image. Recoverability is a practical essential for protecting the valuable host image from being distorted. After the authorized participants retrieve a loss less secret image, they can remove the shadows from the shadow images to recover the unmarked host image. The experimental results exhibit that the proposed scheme can share a large secret capacity according to the threshold t and retain superior quality of around 52 dB.