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This work proposes a high-capacity scheme for separable reversible datahiding in encrypted images. At the sender side, the original uncompressed imageis encrypted using an encryption key. One or several data hiders use the MSB ofsome image pixels to hide additional data. Given the encrypted image containingthis additional data, with only one of those data hiding keys, the receiver canextract the corresponding embedded data, although the image content will remaininaccessible. With all of the embedding keys, the receiver can extract all ofthe embedded data. Finally, with the encryption key, the receiver can decryptthe received data and reconstruct the original image perfectly\ignore{ withoutthe data embedding key(s) }by exploiting the spatial correlation of naturalimages. Based on the proposed method a receiver could recover the originalimage perfectly even when it does not have the data embedding key(s) and theembedding rate is high.

A High-Capacity Separable Reversible Method for Hiding Multiple Messages in Encrypted Images