Digital watermarking using DWT and DES

The digital data are transmitted using the Internet. So digital data must be secure, copyright protected, and authenticated at the same time. This paper proposes an algorithm to protect digital data by embedding watermark that is encrypted by DES algorithm. Two level discrete wavelet transformation (DWT) is applied to the original image. This ensure robustness of the proposed scheme. DES encryption to the watermark with a key and iterating operations ensure security of the watermark information. Encryption and decryption key is same for both the process. If we want to extract the watermark image, we must obtain the secret key. The experimental result shows that the watermark is robust against various attacks.