Youngdai Ko Changhoon Lee Seokhie Hong Sangjin Lee Related Key Differential Cryptanalysis of Full-Round SPECTR-H64 and CIKS-1. 137-148 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3108&spage=137 2004 conf/acisp/2004 ACISP db/conf/acisp/acisp2004.html#KoLHL04