Robust steganography of large capacity lossless images based on visual cryptography and ptychography

Abstract

We propose a robust steganography scheme for large-capacity lossless images based on visual cryptography and ptychography. The introduction of the quick response code as a container for information hiding can realize the lossless extraction of information and performs well in robustness when subjected to compression, noise, and tailoring attacks. The security of the proposed system is provided by the Arnold scrambling algorithm, the visual cryptographic scheme, and the structural parameters of ptychography. The proposed method is verified with optical experiments. In the experiments, a spatial light modulator is used to complete specific experiments through nonmechanical moving ptychography, which greatly reduces the error of traditional ptychography experiments and improves the quality of reconstruction. The results demonstrate that the method can achieve satisfactory robustness performance with high repeatability and excellent information fidelity.