CA refers to the Certificate Authority, that is, CA Center, which is responsible for issuing and managing digital certificates as valid credentials for identity authentication. The main responsibility of CA is to verify and issue digital certificates, which are widely used in identity authentication, data encryption and digital signature.

CA institutions are usually operated by the government or third-party institutions to ensure the authority and credibility of digital certificates. Digital certificate is issued by CA organization, which contains the user's identity information and public key, as well as the signature of CA organization. When one user needs to verify the identity of another user, the validity can be confirmed by verifying the CA signature in the digital certificate.

CA institutions play an important role in the field of network security. They provide effective credentials for identity authentication and ensure the security and credibility of network communication.

CA is the authority responsible for issuing and managing digital certificates, which are widely used in identity authentication, data encryption and digital signature. As an effective authentication certificate, CA provides a credible certificate in the field of network security, which ensures the security and credibility of network communication.

The Cyber Security Law of the People's Republic of China stipulates that the state promotes the establishment of a unified public key system. Managers of key industries and fields should adopt public key technology to ensure the security of key information communication under the condition of having corresponding infrastructure. Digital certificates are managed by the National Cryptography Administration or its authorized institutions. Therefore, as the issuing and managing institution of digital certificates, the responsibilities and operations of CA are regulated and supervised by relevant laws and regulations.