@conference {wacha07,
	title = {Disclosing secrets in watermarking and data hiding},
	booktitle = {Third Wavila Challenge (WaCha)},
	series = {ECRYPT proceedings series from the Otto-von-Guericke University, Magdeburg, Germany},
	year = {2007},
	month = {14 June},
	address = {Saint-Malo, France},
	keywords = {data-hiding, security, watermarking},
	author = {Luis P{\'e}rez-Freire and Fernando P{\'e}rez-Gonz{\'a}lez}
}
