Digital certificate is a series of numbers representing the identity information of all communication parties in Internet communication, and provides a way to verify the identity of communication entities on the Internet. A digital certificate is not a digital ID card, but a seal or stamp affixed by an identity authentication institution (or a signature affixed to a digital ID card).

There are many numbers and English in the digital certificate, which bind the public key and the real identity of the holder. When a digital certificate is used for identity authentication, it will randomly generate a 128-bit identity code, and each digital certificate can generate a different corresponding number every time, thus ensuring the confidentiality of data transmission, which is equivalent to generating a complex password.

Extended data?

In order to avoid the security risks such as certificate loss caused by improper use in the traditional digital certificate scheme, Alipay creatively launched a dual certificate solution: when Alipay members apply for digital certificates, they will get two certificates at the same time, one for verifying Alipay accounts and the other for verifying the computers currently used by members.

The second certificate cannot be backed up. Members must apply for a new certificate for each computer. In this way, even if a member's digital certificate is illegally stolen by others, he can still ensure that his account will not be lost.

Payment shield is a physical security tool similar to USB flash drive. Its built-in micro smart card processor can block various risks and keep your account in a safe environment all the time. At present (20 15.06), the way to ensure e-mail security is digital certificate.

Baidu Encyclopedia-Digital Certificate