MultiMSB Compression Based Reversible Data Hiding Scheme in

Multi-MSB Compression Based Reversible Data Hiding Scheme in Encrypted Images Source: IEEE Transactions on Circuits and Systems for Video Technology (2020) Authors: Fan Chen, Yuan, Hongjie He*, Miao Tian, Heng-Ming Tai Speaker: Shuying Xu Date: 2020/08/06 1

Outline • Introduction • Proposed Scheme • Experimental Results • Conclusions 2

Introduction(1/1) 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

Related work(1/1) 4

Proposed Scheme(1/5) Framework of the encryption scheme 5

Proposed Scheme(2/5) Iterative MSB-Inversion Prediction (IMIP)

Proposed Scheme(3/5) Adjacent Prediction Plane XOR (APPX) 01110000 72 112

Proposed Scheme(4/5) Block Variable Length Coding (BVLC)

Proposed Scheme(5/5) Minimization & Encryption (M&E) ry

Proposed Scheme(5/5) Image Decryption and Recovery i) Image compression bits extracting iii) APPX recovery. ii) BVLC decoding iv) IMIP recovery

Experimental Results(1/3) 11

Experimental Results(2/3) 12

Experimental Results(2/3) 13

Conclusions • 1) The multi-MSB compression is designed to obtain a larger embedding space. • 2) The proposed algorithm enables the reduction of the number of pixels in the encrypted image while satisfying the embedded additional data (used for the cloud manager for image management, verification, and retrieval). • 3) The proposed method also effectively thwarts the COA attack and retrieves the decrypted image consistent with the original image. 14