Improved joint reversible data hiding in encrypted images |
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Affiliation: | 1. School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China;2. College of Information Engineering, Shanghai Maritime University, Shanghai 200135, China;3. School of Computer Science, Fudan University, Shanghai 200433, China;4. Department of Information Engineering and Computer Science, Feng Chia University, Taichung 40724, Taiwan |
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Abstract: | This paper proposes an improved method of reversible data hiding in encrypted images (RDH-EI). Three parties constitute the proposed system: the image owner, the remote server and the recipient. To preserve privacy, an image owner encrypts the original image using a stream cipher algorithm and uploads the ciphertext to a remote server. On server side, a data-hider is allowed to embed additional message into the encrypted image using a swapping/shifting based algorithm. After downloading the marked encrypted image from the server and implementing the decryption, a recipient can extract the hidden messages and losslessly recover the original image. Experimental results show that the proposed method achieves a larger payload than the related works. Meanwhile, a limitation in the related works that few bits can be embedded into the encrypted medical images is also eliminated in the proposed method. |
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Keywords: | Reversible data hiding Image encryption Image recovery |
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