Review on robust watermarking of compressed and encrypted JPEG2000 images

Digital asset management system (DAMS) handles digital assets. For ownership declaration or copyright management, DAMS need to watermark the digital assets. For more efficiency and protection, it is necessary to watermark the digital assets in the compressed-encrypted domain. In compression process, encoding information using fewer bits than original representation and encryption is carried out by mixing the compressed bit stream. Attempting to watermark over this compressed-encrypted domain can cause degradation of the quality of the media. So it is necessary to choose an encryption media that provide both security and efficient watermarking. The extraction of the watermark can be done in decrypted domain. In this paper stream cipher is the encryption algorithm. Here the robust watermarking algorithm for JPEG2000 compressed and encrypted image using three different existing watermarking schemes. Watermarking in the compressed,encrypted content saves the computation complexity as it doesn´t require decompression or decryption and also preserves the confidentiality of the contents.