ZhenChao Zhu Yuqing Zhang Fengjiao Wang The Analysis of an Efficient and Provably Secure ID-Based Threshold Signcryption Scheme and Its Secure Version. 210-225 2008 ProvSec http://dx.doi.org/10.1007/978-3-540-88733-1_15 conf/provsec/2008 db/conf/provsec/provsec2008.html#ZhuZW08