Robust watermarking technique using Arnold´s transformation and RSA in discrete wavelets

Copyright protection is a major concern in digital data transmission over public channel. For copyright protection, watermarking technique is extensively used. A robust watermarking scheme using Arnold´s transformation and RSA algorithm in the DWT domain has been proposed in our paper. The combined encryption has been taken to provide more security to the watermark before the embedding phase. The PSNR value shows the difference between original cover and embedded cover is minimal. Similarly, NC values show the robustness and resistance capability of the proposed technique from the common attacks such as JPEG compression, scaling etc. Thus, this combined version of Arnold´s transformation and RSA algorithm can be used in case of higher security requirement of the watermark signal.