Partial reversible data hiding scheme using (7, 4) hamming code

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Presentation transcript:

Partial reversible data hiding scheme using (7, 4) hamming code Source: Multimedia Tools and Applications, Volume 76, Issue 20, October 2017, pp 21691–21706 Author: Biswapati Jana, Debasis Giri, Shyamal Kumar Mondal Speaker: Su Guodong Date: 2019-01-24

Outline Introduction Related works Proposed scheme Experiments Conclusions

Introduction Secret message: 10101100110……. Original image Stego image Secret message: 10101100110……. Hiding Reversible Extracted Secret message: 10101100110…….

Related Work(1/3)—(7,4) Hamming code-Encoding Encoded data Encoding d1 d2 d3 d4 r1 r2 d1 r3 d2 d3 d4 1 Data: 1 1 0 1 Data(CW):

Related Work(2/3)—(7,4) Hamming code-Error correcting Received data(RCW): 1010101 Error data: 1010111 Corrected data: 1010101 RCW: RCW: Correct

Related Work(3/3)—(7,4) Hamming code-Error correcting Received data(RCW): 1010101 Error data: 1010111 Corrected data: 1010101 z 001 010 011 100 101 110 111 ei 1000000 0100000 0010000 0001000 0000100 0000010 0000001

Proposed scheme(1/10)—Embedding Size: 7 7 pixels Original image 167 166 163 162 165 161 1 LSB

Proposed scheme(2/10)— Embedding Position Number: Position Number: 1 2 3 4 5 6 7 r1 r2 d1 r3 d2 d3 d4 1 2 3 4 5 6 7 r1 r2 d1 r3 d2 d3 d4 Adjust redundant bits using odd parity

Proposed scheme(3/10)— Embedding 1/0 or 0/1: Previous value/Changed value for secret position 0/1 or 1/0: Previous value/Changed value for message bits Secret position: k=5 (using key) : Shared secret key Position Number: Embedding position: w=2 (suitable) 1 2 3 4 5 6 7 r1 r2 d1 r3 d2 d3 d4 1 2 3 4 5 6 7 r1 r2 d1 r3 d2 d3 d4 0/1 1/0 Secret message bits: s =1 1 0 0 1 1 1 0/1 0/1 1/0 0/1 0/1 1/0 1/1 0/1 Secret position: k=2 (from w of the first row) 0/1 0/1 0/1 0/1 Embedding position: w=7 (suitable)

Proposed scheme(4/10)— Embedding 2 3 4 5 6 7 r1 r2 d1 r3 d2 d3 d4 Stego image i : is block number; w : is data embedding position : Changes bits (once) : Non-Changes bits : Changes bits (twice)

Proposed scheme(5/10)— Extraction Size: 7 7 pixels Stego image 166 167 163 162 165 161 1 LSB

Secret position: k=5 (using key) Proposed scheme(6/10)— Extraction Secret position: k=5 (using key) Position Number: 1 2 3 4 5 6 7 r1 r2 d1 r3 d2 d3 d4 1 2 3 4 5 6 7 r1 r2 d1 r3 d2 d3 d4 1

Proposed scheme(7/10)— Extraction Secret message bits: s =1 ….. Error position: 1 2 3 4 5 6 7 r1 r2 d1 r3 d2 d3 d4

Proposed scheme(8/10)— Extraction Secret message bits: s =1 1 ….. Error position: 1 2 3 4 5 6 7 r1 r2 d1 r3 d2 d3 d4

Proposed scheme(9/10)— Extraction Secret position k Data embedding position w Secret message s (r1,r2,r3) data 1 2 3 4 5 6 7 r1 r2 d1 r3 d2 d3 d4 1/0 0/1 5 (010)=2 s=1 1/0 1/0 2 (111)=7 s=1 Secret message bits: s =1 1 0 0 1 1 1 0/1 1/0 7 (101)=5 s=0 1/0 0/1 5 (111)=7 s=0 1/1 1/0 7 (001)=1 s=1 1/0 1/0 1 (110)=6 s=1 1/0 1/0 6 (001)=1 s=1

Proposed scheme(10/10)— Recovery 2 3 4 5 6 7 r1 r2 d1 r3 d2 d3 d4 1 2 3 4 5 6 7 r1 r2 d1 r3 d2 d3 d4 Recovered cover image

Experiments(1/6)--- PSNRs of Stego images

Experiments(2/6)

Experiments(3/6)

Experiments(4/6)- RS analysis

Experiments(5/6)- Relative entropy

Experiments(6/6)- Standard Deviation and Correlation Coefficient

Conclusions Introduce shared secret key and modify shared secret key to enhance the security Partial reversible data hiding Achieve visual quality of stego images are better than others.

Thanks!