Electronic authentication can use simple identity carriers, such as ID cards with smart chips and personal fingerprints. , personal medical information, personal identity card, work status, personal credit, personal experience, income tax, provident fund, pension insurance, real estate information and other information together, through the network to achieve various convenience service procedures of government departments. The core of electronic authentication is digital signature technology, which ensures the uniqueness and legitimacy of user identity. The public key infrastructure (PKI) that must be established to realize digital signature is one of the most important infrastructures in e-government technology and regulations.