Why is the self-examination of Ankang code secret personnel a security code and indeed a time-space companion?

Ankang code secret contacts and infected people have crossed paths, whether they pass by physically or drift in communication signals, they may be considered as time-space companions.

Space-time companionship refers to the mobile phone number that collides with the track of the same base station within a certain distance (for example, more than 10 minutes) in the outdoor open space within 14 days, and is defined as the space-time companionship that may be exposed. In layman's terms, for example, the infected person has been to a place within 14 days, and the trajectory of you 14 days intersects with him. Whether it is a physical brush or a drift in communication signals, it may be considered as a problem of time and space.

In order to facilitate people's travel on the basis of implementing epidemic prevention and control measures, "Know-it-all" APP launched "Anhui Health Code" (referred to as "Ankang Code"). Through the mode of "one person, one code, one yard and three colors", travelers can apply actively and automatically, and realize "clear code" access such as entering and leaving the city, going home, commuting, shopping and buying medicines.