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Improved Reversible Data hiding based on Encrypted Signals with Public Key Cryptosystem

This work proposes an improved version of Chen et al.’s method, which is the first scheme of encrypted signal-based reversible data hiding with public key cryptosystem. The idea of pixel/unit pair division in the original scheme is abandoned. Each pixel/unit is designed to carry one bit of the additional data, and the payload is doubled compared with the original scheme. In addition, the quality of the obtained stego-image/signal is significantly higher due to the fact that the modification on the cover image/signal in data embedding procedure is very little. Analysis and experiments verified the superiority of the proposed method.