Data security using SVD based digital watermarking technique

摘要

Illegal misuse of copyright information such as forgery, manipulation and duplication is not uncommon. To prevent this digital watermarking techniques are widely used thus increasing the robustness and imperceptibility properties in a digital multimedia. In this paper a hybrid scheme using Singular Value Decomposition (SVD) and Discrete Wavelet Transform (DWT) is being proposed. SVD and DWT are matrix based operations, this hybrid method prevents convolution which would otherwise consume a lot of resources. Computation of a larger set of data occurs faster due to the use of SVD. The watermarking scheme proposed is blind and uses a signature based authentication mechanism at the decoder which improves security. The method is subjected to various attacks and is evaluated in terms of PSNR and correlation values. This scheme has been simulated in MATLAB environment.