Reversible data hiding in encrypted binary images by pixel prediction Source: Signal Processing, Vol. 165, pp. 268-277, December 2019 Authors: Honglin Ren, Wei Lu, and Bing Chen Speaker: Wang Xu Date: 2019/08/22

Outline Introduction Proposed method Experiment results Conclusions

Introduction (1/2) Encrypted secret data Data hider Secret data Content owner Original image Encrypted image Embedded, encrypted image Reserve room before image encryption (RRBE) Vacate room after image encryption (VRAE)

Embedded, encrypted image Introduction (2/2) Decrypted image Secret data Embedded, encrypted image Secret data Original image

Proposed method

Proposed method

Proposed method – preprocessing Rearranging the original image UB (uniform block): 1 NUB (non-uniform block): … … (a) The original image (b) The tags (b) The type image

Proposed method – preprocessing Rearranging the original image

Proposed method – Embedding type image

Proposed method – Image encryption Permutation Permutation

Proposed method – Data embedding Data embedding in UBs 1 Secret bits : 010 Secret bits : 101 Embedding 1 1

Proposed method – Data embedding Data embedding in NUBs

Experiment results (1/6)

Experiment results (2/6) [31] B. Feng , W. Lu , W. Sun , Secure binary image steganography based on minimizing the distortion on the texture, IEEE Trans. Inf. Forensics Secur. 10 (2) (2015) 243–255 .

Experiment results (3/6)

Experiment results (4/6)

Experiment results (5/6)

Experiment results (6/6) [32] Our ER (on average) 0.168 0.727 ER (the worst case ) 0.236 Reversibility 100% 99.52% of the images (0.168 bpb) [32] M.S.A. Karim , K. Wong , Universal data embedding in encrypted domain, Signal Process. 94 (2014) 174–182 .

Conclusions high embedding capacity complete separability fine reversibility good security level

Thanks