China. His main research interests include Pairings Based Cryptosystems, Elliptic Curve and Hyperelliptic Curve Cryptography, Provable Security and Design and Analysis of New Public Key Cryptosystems.His main contributions include ID-based ring signature schemes (joint work with Kwangjo Kim) - Asiacrypt 2003, short signature schemes (joint work with Rei Safavi-Naini and Willy Susilo) - PKC 2004 and ID-based short signature schemes (joint work with Willy Susilo and Yi Mu) - Financial Cryptography 2005, and restrictive partial blind signature schemes (joint work with Xiaofeng Chen, Yi Mu and Willy Susilo) - Financial Cryptography 2006. https://en.wikipedia.org/wiki/Zhang_Fangguo