SSL certificate is designed and developed by Netscape Communication Company by establishing SSL Secure Sockets Layer (SSL) security protocol between client browser and Web server. Security protocols are mainly used to provide authentication for users and servers. Encrypt and hide the transmitted data; Ensuring that data is not changed during transmission, that is, the integrity of data, has now become the standard of globalization in this field. Because SSL technology has been established in major browsers and WEB server programs, this function can be activated only by installing the server certificate), that is, it can activate the SSL protocol, realize the encrypted transmission of data information between the client and the server, prevent the leakage of data information, ensure the security of information transmitted by both parties, and users can verify whether the websites they visit are true and reliable through the server certificate. Digital signature, also known as Digital ID, provides a method of authentication on the Internet. It is a kind of digital information file used to identify and prove the identities of both parties in network communication, and its concept is similar to the driver's license or ID card in daily life. Digital signature is mainly used for sending secure e-mail, visiting secure websites, online bidding, online signing, online ordering, online file secure transmission, online office, online payment, online tax payment and online shopping.