@conference {mmsp04:worstcase, title = {Worst case additive attack against quantization-based watermarking techniques}, booktitle = {IEEE International Workshop on Multimedia Signal Processing}, year = {2004}, month = {29 Sept - 1 Oct}, pages = {135-138}, address = {Siena, Italy}, author = {Jose Emilio Vila-Forc{\'e}n and Sviatoslav Voloshynovskiy and Oleksiy Koval and Thierry Pun and Fernando P{\'e}rez-Gonz{\'a}lez} }