The data filled in by Zheng Mintong has become a high-risk area. If people are not there, they will also change their code. What should I do?

During the epidemic, travel tracking played a key role in the process of epidemic prevention and anti-epidemic. A close contact goes home by car from his hometown, and the quarantine personnel will visit him soon after returning home, which can prevent the emergence of a new epidemic to a great extent.

At present, the health code has become a must for going out. We can verify our trip in recent 14 days and inquire whether we have been to high-risk areas.

So, how did we learn about our itinerary? Will various organizations be suspected of infringing citizens' privacy when using this information?

This paper will introduce several travel tracking methods that are popular all over the world during the epidemic. They use different levels of citizen privacy data based on different technical routes. However, their development and application are aimed at fighting the overall situation of the epidemic. I believe that after reading it, you will understand and cooperate.

You can't live without your mobile phone, and so can your trip tracking.

Travel tracking needs reliable and stable data sources, which come from various channels, including our mobile phones, computers and other electronic terminals, electronic ic chips such as ID cards or bank credit cards, and even car navigation and highway toll stations. However, the data from many sources are not true. In order to track the journey more accurately, we often choose the most reliable data sources, such as mobile phones, toll stations, car navigation and so on. Among them, toll stations and car navigation can only track the route information of vehicles. If you want to track your personal trip in real time, you may only have a reliable data source like your mobile phone.

In the electronic payment society, mobile phones have long been people's "personal belongings" and "necessities for survival". It may not matter whether you take your wallet or money out, but if you go out one morning and find that you don't have your mobile phone, we will probably turn around and go home to get it. According to relevant statistics, the number of mobile phone users in China has exceeded 654.38+0 billion, covering almost two-thirds of the population in China. Moreover, because mobile phone users can register their real names, the information resolution and reliability are very high. So the amount of reliable data from mobile phones is huge.

Big data information related to consumption habits and browsing interests is the basis of precision marketing. Personal location and whereabouts records belong to high-level personal privacy information, usually as encrypted data, which ordinary people can't steal. Even the operators' staff can't easily use this kind of information without the authorization of state organs. The epidemic situation in COVID-19 is a major public health event that threatens people's lives and national economic development. The relevant state organs extract and use private information such as citizens' action tracks within their functions and powers, which is a kind of protection for all citizens with the help of private information, in line with relevant laws and regulations and in line with the overall interests of the whole people.

Signaling signal-the most reliable big data source.

We exchange information with the outside world through radio signals sent by mobile phones. These signals will be captured by the operator's base station and Internet companies, which are tracking by filtering this information. When we use mobile phones to communicate information, whether on the phone or online, the radio signals sent and received by mobile phones include not only the voice or text information input by both parties, but also a signal that we as users cannot perceive, which is "signaling".

Signaling signals do not directly convey voice and text information, but carry control functions in the call. To put it simply, when Xiaoming calls Xiaohong through the operator network of the mobile phone, after Xiaoming dials the number, the signaling signal sent by the mobile phone will be transmitted through the operator's base station, and your location and other information will be captured by the operator. At the same time, signaling will request a call at the transfer station. After Xiaohong agrees to talk, Xiaohong's feedback signaling will also be captured by the operator. In this way, the real-time position of people in a certain range can be known through signaling information.

In addition, signaling is not only effective during the call, as long as you have an online mobile phone, it will automatically send a "signaling" signal every once in a while, even if it is turned off. That's why there can be such a scene in the movie: gang bosses will hand in their mobile phones and unplug their batteries before the meeting, for fear of revealing secrets because the signaling signal of their mobile phones is tracked.

Sometimes when we enter a new city, we will automatically receive short messages from operators. It can be seen that when we don't operate the mobile phone, the mobile phone will automatically exchange signaling data with the base station. Similarly, surfing the internet with mobile phones is the same. The difference is that network logs and records will also be crawled by Internet companies, and they often become auxiliary data for signaling. In fact, before it was used to analyze the flow of people during the epidemic, cell phone signals had already played an important role in urban planning. According to relevant surveys, when using big data to analyze urban and rural planning, big data from mobile phones accounts for nearly 80%, of which mobile phone signaling data accounts for more than 30%. Signaling is the most important and reliable big data source.

Bluetooth and QR code can also be used for tracking.

Although mobile phone signaling has many advantages and conveniences in determining the whereabouts of the target, it belongs to a very high level of privacy after all and needs to go through a complicated approval process before it can be called. In order to protect personal privacy as much as possible when tracking infected people in COVID-19, and at the same time lower the administrative approval threshold of tracking technology, many researchers put forward a series of new technologies, including Bluetooth-based tracking technology developed by MIT.