Paulo S. L. M. Barreto Vincent Rijmen Jorge Nakahara Jr. Bart Preneel Joos Vandewalle Hae Yong Kim Improved SQUARE Attacks against Reduced-Round HIEROCRYPT. 165-173 2001 conf/fse/2001 FSE http://dx.doi.org/10.1007/3-540-45473-X_14 db/conf/fse/fse2001.html#BarretoRNPVK01