Julien Cathalo Benoît Libert Jean-Jacques Quisquater Cryptanalysis of a Verifiably Committed Signature Scheme Based on GPS and RSA. 52-60 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3225&spage=52 2004 conf/isw/2004 ISC db/conf/isw/isc2004.html#CathaloLQ04