Digital certificate is a string of numbers that marks the identity information of communicating parties in Internet communication. It provides a way to verify the identity of communicating entities on the Internet. Digital certificates are not digital ID cards, but identity certification agencies. A stamp or seal affixed to a digital ID (or a signature added to a digital ID).

It is issued by an authoritative organization - the Certificate Authority (Certificate Authority) center, and people can use it to identify each other online. A file containing the public key owner information and the public key is only valid for a specific period of time.

Encryption technology (encrypted transmission, digital signature, digital envelope and other security technologies) with digital certificates as the core can encrypt and decrypt, digitally sign and verify the information transmitted on the network to ensure the authenticity of the information transmitted online. Confidentiality, integrity and non-repudiation of transactions. By using a digital certificate, even if the information you send is intercepted by others online, or even if you lose your personal account, password and other information, the security of your account and funds can still be guaranteed.

Extended information:

The principle of digital certificate:

There are many numbers and English in the digital certificate. When using the digital certificate for identity authentication, it will A 128-bit identity code is randomly generated, and each digital certificate can generate a corresponding number that may not be the same every time, thereby ensuring the confidentiality of data transmission, which is equivalent to generating a complex password.

The digital certificate binds the public key and the true identity of the holder. It is similar to the resident ID card in real life. The difference is that the digital certificate is no longer a paper certificate, but A piece of electronic data that contains the identity information of the certificate holder and has been reviewed and issued by the certification center can be more conveniently and flexibly used in e-commerce and e-government.

Baidu Encyclopedia-Digital Certificate