@conference {spie07:bows, title = {Two different approaches for attacking BOWS}, booktitle = {Security, Steganography, and Watermarking of Multimedia Contents}, series = {Proc. of SPIE}, year = {2007}, month = {January}, publisher = {SPIE}, organization = {SPIE}, address = {San Jose, California, USA}, keywords = {BOWS, data-hiding, sensitivity, watermarking}, author = {Pedro Comesa{\~n}a and Fernando P{\'e}rez-Gonz{\'a}lez}, editor = {Edward J. Delp and Ping W. Wong} }