The national health code consists of three numbers: A, B and S. The health code consists of numbers (or letters), and the specific composition is shown in figure 1.

Section A is the user identification, and this number section is authenticated by the real name person.

Available. In other words, the A-segment code is everyone's "identity" on the Internet.

Through this code, you can locate the true identity of its users. In the form of digital coding

Storing personal information facilitates the interconnection of Internet information.

Part b is specific business data. As can be seen from figure 1, the front of section B.

These four parts are easy to understand. It should be noted that "code type" in this standard.

"JKM 1", and "expiration time" refers to the validity period of this health code.

Refers to the expiration time of this health code, not the corresponding health code such as "ID card".

The expiration date of "passport" and so on. But I think the time limit of the health code should be short.

The last valid time of the identity authentication information of the public security department shall prevail. B-segment coding

What is slightly difficult to understand is the "Summary of Authorization Records of Personal Information Subjects" in the last paragraph.

Content. There is also a national standard (GB/T 33560-20 17).

Specified by the relevant algorithm in. The summary of personal information and authorization information is the whole code.

The most important part; We usually use the health code to judge the health status of this person.

Whether it is judged by this part, but the health code is not only part of health.

Kang's decision-making function, its main function is to track the trajectory of code holders, and then

To judge "connections", it should also be pointed out that the second and third parts of paragraph B are related to "reading"

The "coder" is more important, which is the basis for establishing the interconnection of health codes.

The content of paragraph s is a digital signature. Digital signature has been widely used in electronic commerce.

In all aspects of networking, its specific rules are also determined by GB/T 33560-20 17.

Break away from the algorithm. There is not much explanation about the application of digital signature here.