The unlimited growth in internet and multimedia leads to large usage of images resulting in huge storage and distribution of multimedia contents. With increasing use of digital transmission techniques the potential risks for multimedia content is high which lead to necessity of protection for authenticity and confidentiality. To protect the confidentiality, one time pad is supposed to be the most secure algorithm. This paper proposes a secure algorithm to protect the watermark image over a public network in digital watermarking and is embedded in Discrete Wavelet Transformation (DWT). The unique key same as size of watermark is generated from the cover image. One time pad is applied using generated unique key to encrypt the watermark image. The encrypted image so formed is embedded into cover image in DWT domain. The experimental results show the effectiveness and robustness of the algorithm using PSNR and NC calculations.

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The modern era of digital communication facilities bring digital watermarking techniques which is required to copyright and authenticate owner's information which further tracks control of regeneration and redistribution of images over untrusted and public network. In this paper, a blind digital watermarking technique has been proposed using Discrete Cosine Transform (DCT) to embed information in mid frequency. The Arnold 2D cat map is used to shuffle the original pixel positions of watermark color image. First, the watermark image is divided into its RGB components and Arnold 2D transformation has been applied. The original cover image is decomposed into its respective RGB components. The resulting watermark images are embedded into separate components of cover images using DCT. The intensity values of watermark images are hidden in mid frequency of DCT blocks of cover images. So, it doesn't scatter the original watermark to most visual parts of the image. The experimental results show that the algorithm is effective and robust.

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