School;
of;
Computer,;
Wuhan;
University,;
Wuhan;
430072,;
Hubei,;
China;
School;
of;
Science,;
Xi'an;
University;
of;
Technology,;
Xi'an;
710043,;
Shaanxi,;
China;
Department;
of;
Computer;
Engineering;
and;
Mathematics,;
Rovira;
i;
Virgili;
University,;
Tarragona;
E-43007,;
Catalonia,;
Spain;
信息安全; 盲签名; 保密增强技术; 软件注册; 身份密码系统;