Siamak Fayyaz Shahandashti Mahmoud Salmasizadeh Javad Mohajeri A Provably Secure Short Transitive Signature Scheme from Bilinear Group Pairs. 60-76 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3352&spage=60 2004 conf/scn/2004 SCN db/conf/scn/scn2004.html#ShahandashtiSM04