Kazuhiro Suzuki Kaoru Kurosawa How to Find Many Collisions of 3-Pass HAVAL. 428-443 2007 conf/iwsec/2007 IWSEC http://dx.doi.org/10.1007/978-3-540-75651-4_29 db/conf/iwsec/iwsec2007.html#SuzukiK07