Efficient reversible data hiding in encrypted images |
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| Affiliation: | 1. School of Electronics and Information Engineering, Ningbo University of Technology, Ningbo 315016, China;2. CKC Software Lab, Ningbo University, Ningbo 315211, China;1. Institute of Information Science, Academia Sinica, 128 Academia Road, Section 2, Nankang, Taipei 115, Taiwan;2. Department of Computer Science and Engineering, National Chung Hsing University, 250 Kuo Kuang Rd., Taichung 402, Taiwan;1. School of Engineering and Technology, Tra Vinh University, Tra Vinh Province, Vietnam;2. Department of Information Engineering and Computer Science, Feng Chia University, Taichung 40724, Taiwan, ROC;1. Department of Art Design and Creative Industry, Nanfang College of Sun Yat-Sen University, Guangzhou, China;2. Institute of Information Science, Academia Sinica, Taipei, Taiwan;3. Department of Electronic Communication and Software Engineering, Nanfang College of Sun Yat-Sen University, Guangzhou, China;1. Shanghai Key Lab of Modern Optical System, and Engineering Research Center of Optical Instrument and System, Ministry of Education, University of Shanghai for Science and Technology, Shanghai 200093, China;2. School of Communication and Information Engineering, Shanghai University, Shanghai 200072, China |
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| Abstract: | This paper proposes a novel scheme of reversible data hiding in encrypted images based on lossless compression of encrypted data. In encryption phase, a stream cipher is used to mask the original content. Then, a data hider compresses a part of encrypted data in the cipher-text image using LDPC code, and inserts the compressed data as well as the additional data into the part of encrypted data itself using efficient embedding method. Since the majority of encrypted data are kept unchanged, the quality of directly decrypted image is satisfactory. A receiver with the data-hiding key can successfully extract the additional data and the compressed data. By exploiting the compressed data and the side information provided by the unchanged data, the receiver can further recover the original plaintext image without any error. Experimental result shows that the proposed scheme significantly outperforms the previous approaches. |
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| Keywords: | Reversible data hiding Image encryption Embedding payload LDPC code Side information Data compression Least significant bits (LSB) Most significant bits (MSB) |
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