Issue No. 06 - Nov.-Dec. (2018 vol. 15)
Zhenxing Qian , School of Communication and Information Engineering, Shanghai University, Shanghai, China
Hang Zhou , School of Information Science and Technology, University of Science and Technology of China, Hefei, China
Xinpeng Zhang , School of Communication and Information Engineering, Shanghai University, Shanghai, China
Weiming Zhang , School of Information Science and Technology, University of Science and Technology of China, Hefei, China
While most techniques of reversible data hiding in encrypted images (RDH-EI) are developed for uncompressed images, this paper provides a separable reversible data hiding protocol for encrypted JPEG bitstreams. We first propose a JPEG encryption algorithm, which enciphers an image to a smaller size and keeps the format compliant to JPEG decoder. After a content owner uploads the encrypted JPEG bitstream to a remote server, a data hider embeds an additional message into the encrypted copy without changing the bitstream size. On the recipient side, the original bitstream can be reconstructed losslessly using an iterative recovery algorithm based on the blocking artifact. Since message extraction and image recovery are separable, anyone who has the embedding key can extract the message from the marked encrypted copy. Experimental results show that the proposed method outperforms a previous work in terms of separation capability, embedding capacity and security.
Transform coding, Encryption, Data mining, Servers, Cloud computing, Image coding
Z. Qian, H. Zhou, X. Zhang and W. Zhang, "Separable Reversible Data Hiding in Encrypted JPEG Bitstreams," in IEEE Transactions on Dependable and Secure Computing, vol. 15, no. 6, pp. 1055-1067, 2018.