An Efficient Heterogeneous Signcryption Scheme from Certificateless to Identity-based CryptosystemShufen Niu, Zhenbin Li, Miao Tian, Caifen Wang and Xiangdong JiaMATEC Web Conf., 139 (2017) 00037DOI: https://doi.org/10.1051/matecconf/201713900037