P1151345302

Non-Invertible Wavelet Domain Watermarking using Hash Function

*Gangadhar Tiwari1, Debashis Nandi 2, Madhusudhan Mishra3

1,2 IT Department, NIT, Durgapur-713209, West Bengal, India,

3ECE Department, NERIST, Nirjuli-791109, Arunachal Pradesh, India,

1www.icgst.com

http://www.icgst.com/paper.aspx?pid=P1151345302

This paper proposes a novel watermarking technique by employing Secure Hash Algorithm-2 for generating hash from singular values of high frequency component of wavelet transformed sample image and using it as watermark to protect digital images against invertibility attack. The invertibility attack aims to find a fake watermark and fake original from a watermarked image, to falsely claim the ownership. This scheme performs watermarking and compression simultaneously, by hiding the watermark in wavelet domain and employing arithmetic encoding for compression. Data losses are prevented by performing Histogram modification at both pre and post processing stages. Simulation results indicate that the watermarking scheme is secure against invertibility attack; watermark is recoverable even if the content is altered by geometric attacks, and robust to signal processing distortions. Besides, hiding the watermark in middle bit plane of integer wavelet coefficients and its high frequency sub-bands provides better signal quality while arithmetic encoding results in compressed data. The restored images are distortion free

2www.icgst.com

http://www.icgst.com/paper.aspx?pid=P1151345302Non-Invertible Wavelet Domain Watermarking using Hash Function

Abstract

3www.icgst.com

Mr. Gangadhar Tiwari completed B.Sc.(Mathematics) from Guwahati University, Guwahati in 2006 and M.Sc.(Information Technology) from Punjab Technical University,Jalandhar in 2011. Currently, he is pursuing PhD at NIT Durgapur, India.His research interests include Information Security and Digital Image Processing.

NIT Durgapurhttp://www.nitdgp.ac.in/

4www.icgst.com

Dr. Debashis Nandi received his BE degree in Electronics and Communication Engineering from RE College, Durgapur (University of Burdwan), India, in 1994 and M. Tech. Degree from Burdwan University on Microwave Engineering in 1997. He received his PhD degree from IIT, Kharagpur, India on Medical Imaging Technology. His area of research includes Computer security and cryptography, Secure chaotic communication, Video coding. He is an Associate Professor in the Department of Information Technology, NIT, Durgapur, India.

NIT Durgapurhttp://www.nitdgp.ac.in/

5www.icgst.com

Mr. Abhishek Kumar received his B.Tech degree in Electrical and Electronics Engineering from Pondicherry University in 2009 and M.Tech degree in Power System Engineering from North Eastern Regional Institute of Science and Technology, India in the 2012.He is currently working as an Assistant Professor with Department of Electrical & Electronics Engineering, National Institute of Technology, Arunachal Pradesh, India.

National Institute of Technology, Arunachal Pradeshttp://www.nitap.in/

6www.icgst.com

Mr. Madhusudhan Mishra has completed his B.Tech in Electronics and Communication Engineering from North Eastern Regional Institute of Science and Technology (NERIST), Nirjuli, Arunachal Pradesh in 2004 and M.Tech in Signal Processing from IIT Guwahati in 2011. He worked in Sankara Institute of Technology, Kukas, Jaipur for some years and joined NERIST as Assistant Professor in 2006. His main interest of research area includes Digital Signal and Image Processing.

National Institute of Technology, Arunachal Pradeshttp://www.nitap.in/

7