By means of the certificate-checking method,the whole system designs a certificate center that issues X. 509 certificate and manages the certificate through light directory access protocol (LDAP).

• 系统采用基于证书的验证方式 ；专门设计证书中心 ；负责颁发X 5 0 9格式的证书 ；使用目录服务器(LDAP)对证书进行管理 .