Ran Canetti Oded Goldreich Shai Halevi On the Random-Oracle Methodology as Applied to Length-Restricted Signature Schemes. 40-57 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2951&spage=40 2004 conf/tcc/2004 TCC db/conf/tcc/tcc2004.html#CanettiGH04