A HighCapacity Reversible Data Hiding in Encrypted Images
A High-Capacity Reversible Data Hiding in Encrypted Images Employing Local Difference Predictor Source: IEEE Transactions on Circuits and Systems for Video Technology (2020) Authors: Ammar Mohammadi, Mansor Nakhkash and Mohammad Ali Akhaee Speaker: Wang Xu Date: 2020/05/28
Outline • Introduction • Proposed method • Experiment results • Conclusions
Introduction (1/2) Vacating room by specific encryption process (VRSE) Encrypted secret data Data hider Secret data Content owner Original image Encrypted image Reserve room before image encryption (RRBE) Embedded, encrypted image Vacate room after image encryption (VRAE) 3
Introduction (2/2) Decrypted image Secret data Embedded, encrypted image Secret data Original image 4
Proposed method – Local difference predictor 82 82 88 -1 76 83 85 -7 77 78 84 -6 Original block -1 5 2 -5 1 Prediction error block 5
Proposed method – Hiding capacity analyzing 82 82 88 -1 76 83 85 -7 77 78 84 -6 Original block 1001 1111 1110 -1 5 2 -5 1 Prediction error block 0101 0010 1101 0001 Prediction error block Block capacity labels: 6
Proposed method – Image encryption
Proposed method – Embedding BCLs First three pixels: embed the address of b�� and ℓ�� , b�� : the first embeddable block 8
Proposed method – Embedding secret data 00001001 00001111 00001110 00000010 00001101 ℓn: 101 11001001 00000001 Secret data: 100 101 110 1010 01011001 10101110 00000101 111001010010 01011101 10100001 9
Proposed method – Extracting data and recovering original image Secret data: 100 101 110 1010 0101 1010 11001001 01011001 101011101 11100101 1001 01010010 1111 10100001 1110 1001 0101 0010 1101 0001 82 82 88 -1 -1 5 76 83 85 -7 83 2 77 78 84 -6 -5 1 Original block Prediction error block 10
Experiment results (1/5) 11
Experiment results (2/5) 12
Experiment results (3/5) 13
Experiment results (4/5) [7] X. Zhang, J. Long, Z. Wang, and H. Cheng, “Lossless and reversible data hiding in encrypted images with public-key cryptography, ” IEEE Transactions on Circuits Systems for Video Technology, vol. 26, no. 9, pp. 1622 -1631, Sep. 2016. [8] X. Cao, L. Du, X. Wei, D. Meng, and X. Guo, “High capacity reversible data hiding in encrypted images by patch-level sparse representation, ” IEEE Transactions on Cybernetics, vol. 46, no. 5, pp. 1132 -1143, May 2016. [9] K. Ma, W. Zhang, X. Zhao, N. Yu, and F. Li, “Reversible data hiding in encrypted images by reserving room before encryption, ” IEEE Transactions on Information Forensics and Security, vol. 8, no. 3, pp. 553 -562, Mar. 2013. [23] X. Wu, and W. Sun, “High-capacity reversible data hiding in encrypted images by prediction error, ” Signal Processing, vol. 104, pp. 387 -400, Nov. 2014. [10] P. Puteaux, and W. Puech, “An efficient MSB prediction-based method for high-capacity reversible data hiding in encrypted images, ” IEEE Transactions on Information Forensics and Security, vol. 13, no. 7, pp. 1670 -1681, Jul. 2018. 14
Experiment results (5/5) [10] P. Puteaux, and W. Puech, “An efficient MSB prediction-based method for high-capacity reversible data hiding in encrypted images, ” IEEE Transactions on Information Forensics and Security, vol. 13, no. 7, pp. 1670 -1681, Jul. 2018. [13] S. Yi, and Y. Zhou, “Separable and reversible data hiding in encrypted images using parametric binary tree labeling, ” IEEE Transactions on Multimedia, vol. 21, no. 1, pp. 51 -64, Jan. 2019. 15
Conclusions Ø The capacity improvement is 0. 63 bpp and 1. 87 bpp, respectively. Ø The secret data is extracted with no error. 16
- Slides: 16