Digital certificate refers to an electronic document issued by CA organization, which is a series of numbers that can display the identity information of network users, and provides a way to verify the identity of network users on the computer network, so digital certificate is also called digital identification. Digital certificate can ensure the integrity and security of information and data for network users in computer network communication in the form of encryption or decryption.

When you log off, you need to sign a digital certificate to verify your identity before you can log off normally.