Reversible data hiding using histogram shifting method

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1. Optimized Reversible Data Hiding Technique for Secured Data Transmission G uide:- Submitted by: Himanshu bal Department of Information Technology 2015-2016 TE(IT)seminar 14/3/2016 pgno.1 slideno. 1

2. PROBLEM DEFINITION Discussing a solution for reversible data hiding by optimizing the techniques presently available for secured data transmission. TE(IT)seminar 14/3/2016 pgno.1 slideno. 2 Optimized Reversible Data Hiding Technique for Secured Data Transmission

3. OBJECTIVE: G enerate an optimized reversible data hiding technique to overcome the issues in current RHD trends like: Low embedding capacity High distortion rate etc. Low utilization of 2D histogram TE(IT)seminar 14/3/2016 pgno. 1 slideno. 3 Optimized Reversible Data Hiding Technique for Secured Data Transmission

4. INTRODUCTION Steganography is the art or practice of concealing a message, image, or file within another message , image, or file. The word steganography combines the Ancient Greek words steganos, meaning "covered, concealed, or protected”. One of its application is Reversible data hiding (RHD). Reversible data hiding (RDH) is used to embed secret message into a cover image by slightly modifying its pixel values. TE(IT)seminar 14/3/2016 pgno. 1 slideno.4 Optimized Reversible Data Hiding Technique for Secured Data Transmission

5. WHY STEGANOGRAPHY OVER CRYPTOGRAPHY???? TE(IT)seminar 14/3/2016 pgno.2 slideno.5 Optimized Reversible Data Hiding Technique for Secured Data Transmission

6. LITERATURE SURVEY DIFFERENT RDH METHODS: Tian's method of LSB (2003 ). J. Tian, Reversible data embedding using a difference expansion, IEEE Trans. Circuits Syst. Video Technol., vol. 13, no. 8 , pp. 890–896,Aug.2003 Ni et al’s method of histogram shifting ( 2006). Reversible image watermarking on prediction errors by efficient histogram modification, Signal Process ., vol. 92,no. 12, pp. 3000–3009, Dec. 2006. Thodi and Rodriguez hybrid method (2012). , “A Novel Reversible Data Hiding Scheme Based on Two-Dimensional Difference-Histogram Modification”, IEEE Transactions on Information Forensics and Security, July 2012 . TE(IT)seminar 14/3/2016 pgno.2 slideno.6 Optimized Reversible Data Hiding Technique for Secured Data Transmission

7. RELATED WORKS TE(IT)seminar 14/3/2016 pgno.2 slideno. 7 Optimized Reversible Data Hiding Technique for Secured Data Transmission

8. NE ET AL’S METHOD OF HISTOGRAM SHIFTING The method modifies the pixel-pairs with differences 1 or -1 to carry data . F or data embedding, the difference image is first computed for a gray-scale cover image using formula : D( i,j ) = I( i , 2j + 1) – I( i , 2j ) Then marked image is obtained as TE(IT)seminar 14/3/2016 pgno.3 slideno.8 Optimized Reversible Data Hiding Technique for Secured Data Transmission

9. NE ET AL’S METHOD OF HISTOGRAM SHIFTING contd. 1.Then the information bits can be extracted as 2.And finally the original picture can be recovered 3.Here the difference Dm(i,j ) = Im(i,2j+1 ) – Im(i , 2j) is the difference value computed from the marked image . TE(IT)seminar 14/3/2016 pgno. 3 slideno. 9 Optimized Reversible Data Hiding Technique for Secured Data Transmission b= 0, if Dm(i,j)=-1 1, if Dm( i ,j)=+1

10. NOW LETS’S COME TO OUR NEW ENHANCED METHOD TE(IT)seminar 14/3/2016 pgno.4 slideno.10 Optimized Reversible Data Hiding Technique for Secured Data Transmission

11. ARCHITECTURE FOR EMBEDDING AND EXTRACTION ARCHITECTURE FOR EMBEDDING ARCHITECTURE FOR EXTRACTION TE(IT)seminar 14/3/2016 pgno. 4 slideno.11 Optimized Reversible Data Hiding Technique for Secured Data Transmission

12. WORKING OF HISTOGRAM SHIFTING BASED RDH METHOD THE HISTOGRAM SHIFTING BASED RHD METHOD REQUIRE FOUR STEPS TO COMPLETE THE PROCESS: Histogram shifting Encoding process Embedding process Extraction process TE(IT)seminar 14/3/2016 pgno. 5 slideno. 12 Optimized Reversible Data Hiding Technique for Secured Data Transmission

13. HISTOGRAM SHIFTING CONSISTS OF FOLLOWING STEPS Computing difference image for gray scale Using histogram bins for expansion embedding Modification of pixels TE(IT)seminar 14/3/2016 pgno.5 slideno. 13 Optimized Reversible Data Hiding Technique for Secured Data Transmission

14. ENCODING PROCESS Data compression. Using r un length encoding. Counting the runs. TE(IT)seminar 14/3/2016 pgno.5 slideno.14 Optimized Reversible Data Hiding Technique for Secured Data Transmission

15. EMBEDDING PROCESS D ividing the host image into non overlapping blocks. Using LSB replacement to embed the location mapping. embed the LSB sequence Into using shifting and embedding functions Illustration of the data embedding TE(IT)seminar 14/3/2016 pgno.6 slideno. 15 Optimized Reversible Data Hiding Technique for Secured Data Transmission

16. WORKING PRINCIPLE FOR EMBEDDING ANY TYPE OF MESSAGE INFO HIDDEN INFO HIDDEN INFO STEGO KEY COVER MEDIUM STEGO OUTPUT TE(IT)seminar 14/3/2016 pgno.6 slideno. 16 Optimized Reversible Data Hiding Technique for Secured Data Transmission

17. EXTRACTION PROCESS D ividing the marked image blocks. determining the location map. Extraction the embedded data. TE(IT)seminar 14/3/2016 pgno.7 slideno.17 Optimized Reversible Data Hiding Technique for Secured Data Transmission

18. RESULTS OF HISTOGRAM METHOD ORIGINAL IMAGE IMAGE AFTER EMBEDDING HISTOGRAM BASED ON ORIGINAL IMAGE SHIFTED AND EMBEDDED HISTOGRAM TE(IT)seminar 14/3/2016 pgno.7 slideno. 18 Optimized Reversible Data Hiding Technique for Secured Data Transmission

19. PSNR VS EMBEDDING RATE TE(IT)seminar 14/3/2016 pgno. 8 slideno.19 PERFORMANCE ANALYSIS Optimized Reversible Data Hiding Technique for Secured Data Transmission

20. MOTIVATION TE(IT)seminar 14/3/2016 pgno.8 slideno. 20 Optimized Reversible Data Hiding Technique for Secured Data Transmission

21. ADVANTAGES The embedding capacity has been enhanced. The distortion ration is reduced. Better utilization of 2D histogram. Better recovery of image. TE(IT)seminar 14/3/2016 pgno. 9 slideno. 21 Optimized Reversible Data Hiding Technique for Secured Data Transmission

22. CONCLUSION This algorithm can achieve a better performance compared with the state-of-the-art works. So the proposed framework has a potential to provide excellent RDH algorithms. TE(IT)seminar 14/3/2016 pgno.11 slideno.22 Optimized Reversible Data Hiding Technique for Secured Data Transmission

23. TE(IT)seminar 14/3/2016 pgno. slideno. 23 Optimized Reversible Data Hiding Technique for Secured Data Transmission