Mingwu Zhang Yusheng Zhong Bo Yang Wenzheng Zhang Analysis and Improvement of an ID-Based Anonymous Signcryption Model. 433-442 2009 ICIC (1) http://dx.doi.org/10.1007/978-3-642-04070-2_49 conf/icic/2009-1 db/conf/icic/icic2009-1.html#ZhangZYZ09