Thomas Baignères Pascal Junod Serge Vaudenay How Far Can We Go Beyond Linear Cryptanalysis? 432-450 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3329&spage=432 2004 conf/asiacrypt/2004 ASIACRYPT db/conf/asiacrypt/asiacrypt2004.html#BaigneresJV04