ZhenYu Hu Dongdai Lin Wenling Wu Dengguo Feng Constructing parallel long-message signcryption scheme from trapdoor permutation. 82-98 2007 50 Science in China Series F: Information Sciences 1 http://dx.doi.org/10.1007/s11432-007-2018-x db/journals/chinaf/chinaf50.html#HuLWF07