Mihir Bellare Chanathip Namprempre Gregory Neven Security Proofs for Identity-Based Identification and Signature Schemes. 268-286 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3027&spage=268 2004 conf/eurocrypt/2004 EUROCRYPT db/conf/eurocrypt/eurocrypt2004.html#BellareNN04