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

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... he cover image/signal in data embedding procedure is very little. Analysis and experiments verified the superiority of the proposed method.