Nick Howgrave-Graham Joseph H. Silverman William Whyte Choosing Parameter Sets forwithand. 118-135 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3376&spage=118 2005 conf/ctrsa/2005 CT-RSA db/conf/ctrsa/ctrsa2005.html#Howgrave-GrahamSW05