Abstract Content authentication requires that the image watermarks must highlight malicious attacks while tolerating incidental modifications that do not alter the image contents beyond a certain tolerance limit. This paper proposed an authentication scheme that uses content invariant features of the image as a self authenticating watermark and a quantized down sampled approximation of the original image as a recovery watermark, both embedded securely using a pseudorandom sequence into multiple sub bands in the Discrete Wavelet Transform (DWT) domain. The scheme is blind as it does not require the original image during the authentication stage and highly tolerant to Jpeg2000 compression. The scheme also ensures highly imperceptible watermarked images and is suitable in application with low tolerance to image quality degradation after watermarking. Both Discrete Cosine Transform (DCT) and DWT transform domain are used in the watermark generation and embedding process.

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[19] Seng, W., Jiang Du J., and Pham B., Semi Fragile Watermark with Self Authentication and Self Recovery, Malaysian Journal of Computer Science, vol. 22, no. 1, pp. 64-84, 2009. Jayashree Pillai earned her BE degree in Computer Science from Tamilnadu College of Engineering, Coimbtore, M.Tech degree in Computer Science from M. S Ramaiah Institute of Technology, Bangalore and is presently pursuing her research from Mother Teresa Women s University, Kodaikanal, in the area of image authentication. She is presently working as Associate Professor, Department of MCA, AIMS Institute of Higher Education, Bangalore. Her interests are in the field of Computation, networking and security. She has a number of national and international publications in the area of wireless sensor networks and image authentication. Padma Theagarajan has a Masters degree in Computer Applications from Alamelu Angappan College for Women in 1988 and M. Tech from AAU. She did her Ph. D in C. Sc from Mother Teresa Women s University, Kodaikanal. At present, she is the Professor and Head of MIS, Dept. of MCA, Sona college of Technology, Salem. She has a number of National and International publications to her credit and serves as editor and reviewer of a number of well known national and international She also serves as a subject expert in the BOS of various institutions. She is a Life Member of ISTE and CSI and her areas of specialization include Artificial intelligence, Data mining, DSS and Knowledge based systems.