Reversible data hiding in encrypted images based on progressive recovery - 2016


This paper proposes a methodology of reversible knowledge hiding in encrypted pictures (RDH-EI) based on progressive recovery. 3 parties are involved in the framework, as well as the content owner, the info-hider, and therefore the recipient. The content owner encrypts the original image employing a stream cipher algorithm and uploads a ciphertext to the server. The information-hider on the server divides the encrypted image into three channels and, respectively, embeds totally different amount of extra bits into every one to get a marked encrypted image. On the recipient aspect, further message will be extracted from the marked encrypted image, and the original image can be recovered while not any errors. While most of the traditional ways use one criterion to recover the whole image, we tend to propose to try and do the recovery by a progressive mechanism. Rate-distortion of the proposed method outperforms state-of-the-art RDH-EI ways.

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