CA, the abbreviation of Certification Authority, generally refers to CA certificate, which is an electronic document issued by CA organization. It is a series of numbers that can show the identity information of network users and provides a way to verify the identity of network users on the computer network.

The content of CA certificate includes the information of electronic visa authority, public key user information, public key, signature and the validity period of the authority. At present, the format and verification method of certificate generally follow the international standard of X.509 digital certificate, and the user information and CA's signature are appended to the user's public key. The public key is one part of the key pair, and the other part is the private key.

Certificate principle

Digital certificate is attached with user information and CA's signature after the user's public key. The public key is one part of the key pair, and the other part is the private key. The public key is public and can be used by anyone. Only you know the private key. Information encrypted with a public key can only be decrypted with the corresponding private key. To ensure that only one person can read his letter, the sender should encrypt the letter with the receiver's public key.

The recipient can decrypt the letter with his own private key. Similarly, in order to confirm the identity of the sender, the sender should sign the letter with his own private key; The receiver can use the sender's public key to verify the signature to confirm the sender's identity.

Extended data:

There are ten technical standards in CAC induced abortion ecosystem, which are designed for the safety of induced abortion operation, no harm to women's fertility after operation, full care and care for patients and patients' privacy. All technical standards are indispensable.

It is hoped that through these strict standards, the risk of induced abortion will be minimized, the complications and sequelae of surgery will be avoided as much as possible, and the safety of patients will be guaranteed as much as possible.

CA can prove the identity of the entity and the legitimacy of its public key, and prove the matching relationship between the entity and the public key. A certificate is the carrier of the public key, and the public key on the certificate is bound to the entity identity. One is the PKI mechanism of certificate line signature, which is generally a double certificate mechanism, that is, an entity must have two certificates and two keys, one is an encryption certificate and the other is a signing certificate, and the encryption certificate cannot be used for signature in principle.