Takeshi Okamoto Hirofumi Katsuno Eiji Okamoto A Fast Signature Scheme Based on New On-line Computation. 111-121 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2851&spage=111 2003 conf/isw/2003 ISC db/conf/isw/isc2003.html#OkamotoKO03