simply speaking, CA certification is verified by an authoritative department.

CA, also known as e-commerce certification center, is the authoritative organization responsible for issuing and managing digital certificates, and as a trusted third party in e-commerce transactions, it undertakes the responsibility of verifying the legality of public keys in the public key system.

CA is the issuing authority of certificates, and it is the core of PKI. CA is the authority responsible for issuing certificates, authenticating certificates and managing issued certificates. It should formulate policies and specific steps to verify and identify the user's identity and sign the user's certificate to ensure the identity of the certificate holder and the ownership of the public key.

a ca also has a certificate (containing a public key) and a private key. Public users on the Internet trust CA by verifying its signature, and anyone can get CA's certificate (including public key) to verify the certificate issued by it.

Extended materials:

Role of p>CA authentication

1. Confidentiality-Only the recipient can read the information.

2. Authenticity-Confirm the identity of the information sender.

3. Integrity-information will not be tampered with during transmission.

4. Non-repudiation-the sender cannot deny the information sent.

Reference: Baidu Encyclopedia -CA Certification.