Jianhong Zhang Qianhong Wu Yumin Wang A New Efficient Group Signature With Forward Security. 321-326 2005 29 Informatica (Slovenia) 3 http://www.informatica.si/PDF/29-3/08_Zhang-A%20New%20Efficient%20Group....pdf db/journals/informaticaSI/informaticaSI29.html#ZhangWW05