Responsible for auditing the user's identity and issuing electronic signature authentication certificates to users under the condition of ensuring the user's identity is true. It is a professional department that issues and manages certificates, and provides online identity authentication, electronic signature and other certificate authentication security services for e-government and e-commerce applications. Features: Electronic authentication service refers to the activity of providing authenticity and reliability verification for all parties involved in electronic signature. Electronic certification service providers refer to organizations that provide certification services for electronic signatures requiring third-party certification (hereinafter referred to as "electronic certification service organizations").