Dynamic QR code: There are two kinds of literal meanings: one is visual code animation dynamic two-dimensional code, that is, moving two-dimensional code, but this two-dimensional code has been redesigned by technical drawing means, for art two Dimensional code, usually used for media promotion, to attract customers' attention. As shown below.
The other is a two-dimensional code with time, number of times, etc., which is encrypted by time, number of times, etc., with time refresh, screenshot or active sharing, which can only be used for a few minutes and has a limit on the number of times. It is used in the security access control industry and has high security.
Today we are talking about how the second dynamic QR code works in the access control industry:
First of all, we introduce the dynamic QR code generation in the access control industry: there are three common types: 1. Through APP generation, many access control manufacturers have their own APP software, APP is associated with background control software. Advantages: APP is powerful, except In addition to the commonly used functions of access control, it also integrates some value-added service functions, with high user loyalty and obvious economic benefits. Disadvantages: high development costs and low penetration rate. 2, Wei letter public account generation, advantages: a wider application group, low development costs, convenient and flexible management, easy to suck powder. Disadvantages: Maintenance Weixin public account developers lack access control related knowledge, long development cycle, BUG. 3, Wei letter small program generation, advantages: no download, ready to use, no memory, low development costs, disadvantages: simple function, weak scalability.
Regardless of the access control software, the QR code plus password rules are different, but the principle is the same: encryption by time, number of times, etc. has a time refresh, screenshots or active sharing can only be used for a few minutes and has a limit on the number of times.
How dynamic QR codes work:
In the server background, first record the shou number of the person who needs to open the door to the background, and assign the opening permission.
After registering with your own shou machine number + verification code, the individual generates a dynamic QR code. Only when the software has registered the door opening permission, you can directly scan the code to open the door. If you have not registered the door opening permission in the background, even if 2D is generated. Code, can not scan the code to open the door.
In the case of offline and disconnected network, the all-in-one machine has its own storage function, which can store 40,000 user data offline. If the customer has no network, as long as the user in the whitelist can scan the code to open the door, restore the network. After that, the data is automatically uploaded to the server.
The dynamic QR code workflow can refer to the following figure
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4. In the background of the registered machine No. shou access permission is not set time limit (e.g., three months period), two-dimensional code may be used directly, with no time limit. However, the shared QR code can be set to the time and number of times. The visitor can use the shared default QR code to scan the code once in 10 minutes. If the shared QR code is used once, it will be invalid.
5. In the background, you can view the detailed information of the entry and exit, which are entered through the normal shou machine QR code, which are entered by sharing the QR code, and even the unsuccessful record of the invalid QR code can be queried.
When all the rights of the dynamic QR code are judged in the background of the online connection, the background management software judges the legitimacy. If the network is disconnected, the two-dimensional code cloud access control machine judges the legality according to the white list of the synchronous management background.
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