Lecture Notes in Computer Science 3200

A problem of considerable theoretical interest in digital watermarking is that of asymmetric, or zero-knowledge watermarking. In this problem, we wish to embed a watermark in a piece of multimedia and later prove that we have done so, but without revealing information that can be used by an adversary to remove the signal later. In this paper we develop a watermarking system based on the ambiguity attack method outlined in [14], constructing a vector-based watermarking system applicable to images, audio and video. An example of image watermarking is provided. We also outline some important attacks and thus important design principles for asymmetric watermarking systems.