A cryptanalytic method for embedding video watermarks

Digital video watermarking is increasingly important. Video signals are very susceptible to attacks like frame averaging, dropping, swapping, collusion. This paper presents a new video watermarking method. The most important information to be watermarked such as a company's name is hidden in a sequence of statistical data, which is then embedded into each frame. Every segment of the statistical data is typically enough for the key watermark extraction. A very detailed example of this method is given, based on the cryptanalysis. The most important information is used as the key to encrypt a plaintext. The plaintext can be some less important information about the product. The ciphertext is then embedded in the video frames. With statistical knowledge of the English language, we can quickly recover the key. Mathematical analysis and simulation results are given in the paper.