International Journal of Computer Techniques -– Volume 2 Issue 6, Nov- Dec 2015 ISSN :2394-2231 http://www.ijctjournal.org Page 27 Resilience of Various Attacks on Watermarks Using Hybrid Video Watermarking Algorithm Mrs. C.N.Sujatha 1 , Dr. P. Satyanarayana 2 1 Associate Professor, Dept. of ECE, SNIST, Yamnampet, Ghatkesar Hyderabad-501301, Telangana,India 2 Professor, Dept. of ECE , AITS, Tirupati-, Andhrapradesh, India. ----------------------------------------************************---------------------------------- Abstract: Watermarking with unaffected detection and high robustness capabilities is still a challenging problem. The success of a digital watermarking technology depends greatly on its robustness to withstand attacks which are aimed at removing or destroying the watermark from its host data. This paper provides analysis of a number of digital watermark attacks and the experimental results are provided to show the effect of these attacks on watermarks using hybrid video watermarking technique based on DWT, DCT and SVD. The main idea of this paper is to develop an algorithm which can be robust to various attacks, that embeds the watermark information without much distortion to the host video by modifying the frequency coefficients of the frames, while making it possible to extract the watermark by using the inverse algorithm. Based on human visual systems perception of video content, which is used to embed a watermark such that its amplitude is kept below the distortion sensitivity of the pixel and thus preserving the video quality. The operation of embedding and extraction of the watermark is done in frequency domain, and it is checked for different signal processing, geometric and noise attacks. This paper has conducted a comprehensive research with special emphasis on the malicious attacks against digital watermarking. Keywords — Attacks, robustness, watermarking, DWT, DCT, SVD, PSNR, CF ----------------------------------------************************---------------------------------- I. INTRODUCTION Digital video watermarking is a technique for embedding additional data along with video signal. Embedded data is used for copyright owner identification. A number of video watermarking techniques are proposed [1]. These techniques take advantage of different ways in order to embed a robust watermark and to maintain the original video signal fidelity. Watermarking is a potential method for protection of ownership rights on digital audio, image and video data. First, an overview of the current attacking methods will be discussed. Second, attacks are described by exploiting knowledge about the statistics of the embedded and retrieved watermark. The full strength of attacks can be achieved by introducing additional noise, where the attacker tries to combine the watermark and the additive noise to impair watermark communication as much as possible while fulfilling a quality constraint on the attacked video. With a sophisticated quality constraint, it is also possible to exploit human perception like the human auditory system in case of audio watermarks and the human visual system (HVS) in case of image and video watermarks. Apparently any image watermarking technique can be extended to watermark videos, but in reality video watermarking techniques need to meet other challenges than that in image RESEARCH ARTICLE OPEN ACCESS