Yumin Yuan Da Li Liwen Tian Haishan Zhu Certificateless Signature Scheme without Random Oracles. 31-40 2009 ISA http://dx.doi.org/10.1007/978-3-642-02617-1_4 conf/sersc-isa/2009 db/conf/sersc-isa/isa2009.html#YuanLTZ09