Wei Wu Yi Mu Willy Susilo Xinyi Huang Certificate-Based Signatures: New Definitions and a Generic Construction from Certificateless Signatures. 99-114 2008 WISA http://dx.doi.org/10.1007/978-3-642-00306-6_8 conf/wisa/2008 db/conf/wisa/wisa2008.html#WuMSH08