Jian Weng Xiangxue Li Kefei Chen Shengli Liu Identity-Based Parallel Key-Insulated Signature Without Random Oracles. 1143-1157 2008 24 J. Inf. Sci. Eng. 4 http://www.iis.sinica.edu.tw/page/jise/2008/200807_09.html db/journals/jise/jise24.html#WengLCL08