Dept.of Computer Science and Eng.,Shanghai Jiaotong Univ.,Shanghai 200030,China;
Dept.of Computer Science and Eng.,Shanghai Jiaotong Univ.,Shanghai 200030,China;
Dept.of Computer Science and Eng.,Shanghai Jiaotong Univ.,Shanghai 200030,China;
digital signature; improved Rabin signature; provable security; random oracle model;