Design and Analysis of Watermarking Techniques for Compressed Encrypted images

Abstract

The continuous growth of Internet technology has made the communication and circulation of digital multimedia content easy. However, this leads to an increase in undesirable and often illegal operations such as duplication, modification, forgery, and copyright infringement. Therefore, the digital watermarking techniques have been developed for copyright protection, content authentication, and ownership identification of multimedia content such as image and video. Digital Right Management systems (DRMs) generally handle media data in a compressed and encrypted form. It is often necessary to watermark these media items in the compressed-encrypted domain itself for tamper detection or ownership declaration or copyright management purposes. It is a challenge to watermark these compressed encrypted streams as the compression process would have packed the information of raw media into a low number of bits and encryption would have randomized the compressed bit stream. Attempting to watermark such a randomized bit stream can cause a dramatic degradation of the media quality. Thus it is necessary to choose an encryption scheme that is both secure and will allow watermarking in a predictable manner in the compressed encrypted domain. newline