Jacques Stern Julien P. Stern Cryptanalysis of the OTM Signature Scheme from FC'02. 138-148 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2742&spage=138 2003 conf/fc/2003 Financial Cryptography db/conf/fc/fc2003.html#SternS03