Yusuke Naito Yu Sasaki Takeshi Shimoyama Jun Yajima Noboru Kunihiro Kazuo Ohta Improved Collision Search for SHA-0. 21-36 2006 conf/asiacrypt/2006 ASIACRYPT http://dx.doi.org/10.1007/11935230_2 db/conf/asiacrypt/asiacrypt2006.html#NaitoSSYKO06