Reversible data hiding in encrypted images using pseudorandom sequence modulation

Authors:
Xinpeng Zhang;Chuan Qin;Guangling Sun
Affiliations:
School of Communication and Information Engineering, Shanghai University, Shanghai, P.R. China;School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai, P.R. China;School of Communication and Information Engineering, Shanghai University, Shanghai, P.R. China
Venue:
IWDW'12 Proceedings of the 11th international conference on Digital Forensics and Watermaking
Year:
2012

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Abstract

This work proposes a novel reversible data hiding scheme for encrypted images based on a pseudorandom sequence modulation mechanism. In the first phase, a content owner encrypts the original image for content protection. Then, a data-hider replaces a small proportion of data in LSB planes of encrypted image with the additional data and modifies the rest data in LSB planes according to the pseudorandom sequences modulated by the replaced and embedded data. With the encrypted image containing additional data, an additional-data user knowing the data-hiding key can extract the embedded additional data. And a content user with the encryption key may decrypt the encrypted image containing additional data to obtain the principal original content. If someone receives the decrypted image and has the data-hiding key, he can also successfully extract the additional data and perfectly recover the original image by exploiting the spatial correlation in natural image.