CA (CertificationAuthority) is the international name for certification agencies. It refers to the organization that issues, manages, and cancels digital certificates to applicants for digital certificates. The role of the CA is to check the legitimacy of the certificate holder's identity and issue the certificate (sign on the certificate) to prevent the certificate from being forged or tampered with. ?

The certificate binds the public key data, the identity information of the corresponding private key owner, and the digital signature of the CA. The certificate also contains the name of the CA (LOISCA in the picture) so that the relying party can find the CA's public key and verify the digital signature on the certificate.

A digital certificate is actually a record stored on a computer. It is a statement issued by a CA, proving that the subject of the certificate (the "certificate applicant" becomes the "certificate subject" after possessing the certificate) and the certificate The unique correspondence between the public keys contained in . The certificate includes the name and related information of the certificate applicant, the applicant's public key, the digital signature of the CA that issued the certificate, and the validity period of the certificate. The function of digital certificates is to enable both parties to online transactions to verify each other's identities and ensure the security of e-commerce.

CA is roughly divided into the following types:

1. Industrial CA

Financial CA system, telecommunications CA system, postal CA system, Ministry of Foreign Trade and Economic Cooperation CA,

China Customs CA, Bank of China CA, Industrial and Commercial Bank of China CA, China Construction

Bank CA, China Merchants Bank CA, State Planning Commission E-Government CA, Nanhai Nature

Personal CA (NPCA)

2. Regional CA

Xie Card Certification System (Shanghai CA, Beijing CA, Tianjin CA)

NetCertificate System (Guangdong CA, Hainan CA, Hubei CA, Chongqing CA)

3. Independent CA certification center

–Shanxi CA, Jilin CA, Ningxia Western CA, Shaanxi CA, Fujian CA, Heilong

Jiang Post CA, Heilongjiang Government CA, Shandong CA, Shenzhen CA, Jilin Provincial Government

Government CA, Fujian Quanzhou Commercial Bank Online Banking CA, Tianwei Integrity CA

Reference: CA-Baidu Encyclopedia