In the current video surveillance system, the transmission system is different due to different security levels. This paper mainly analyzes the three aspects of video transmission line security, video transmission network security, and video information encryption security.
Video transmission line security
At present, the video surveillance system has different transmission systems due to different security levels. In the process of video information transmission, it mainly includes public security dedicated communication network, video image private network, virtual private network (VPN) and public network transmission (including mobile internet transmission).
Due to public safety and confidentiality, the public security private communication network has good confidentiality for video transmission, and the second is video image information private network, but both have certain limitations. Because these two transmission lines are dedicated to dedicated lines, the cost is high, and the cost of operation and maintenance management is high, so that video transmission cannot be shared by video transmission.
At present, in the video surveillance networking construction process, more applications are virtual private networks (VPNs), that is, logical networks that are built on the network platforms provided by public network service providers, so that video information is transmitted in logical links. The transmission line can be used for internal networking of government, enterprise headquarters and branch offices. Not only is the network construction fast and convenient, it saves the cost of use, and more importantly, the network is safe and reliable. At present, the virtual private network mainly adopts the international standard network security technology, and establishes the logical tunnel and the network layer encryption on the public network to prevent the video information from being modified and stolen, thereby ensuring the security and integrity of the video information data.
Video transmission network security
With the construction of video surveillance from the central city to the county, to the township, to the final village-level unit, the video surveillance network construction continues to expand, and video information resources from different regions need to be collected in the cloud center platform through the transmission system. In the whole process, because the network carried by each level of the video surveillance system is different, the way to access the cloud platform system varies from one level to another, and the security level of the network security is different due to different security levels, so the entire system exists. With the problem of network coverage and scope of use and security protection measures being inconsistent, the interconnection between networks may cause the risk of the security level of one of the network trust domains to decline. For example, interconnecting between different network security levels may bring about the risk of launching various malicious attacks on the urban video surveillance private network from other public networks.
Generally, to realize the secure transmission of video data between networks of different security levels and to ensure the security of video information, most of them set up different network video transmission channels scientifically and rationally, and classify and manage video information through multimedia technology and network technology, and video surveillance system. The business data and media data are operated by separate channels, which can effectively solve the above problems. At present, a physical dual-channel video surveillance security access system that is divided into a signaling stream and a media stream based on a transmission channel type is a relatively common choice.
Video information encryption security
In the process of video information transmission, in addition to ensuring the security of video information transmission lines and video transmission networks, there are more important measures to ensure the security of video surveillance data itself, that is, data encryption is used for some video information with higher security level. Technologies and software measures to actively protect monitoring data information, such as data encryption, data integrity protection, and two-way identity authentication.
Data encryption can encrypt the service data in the video information, and encrypt the control commands and parameters related to the service to improve the security of the video transmission. At the same time, the media video stream can be encrypted. Through scientific and reasonable encryption processing of media streams and signaling streams, network attacks can be effectively prevented, and data information leakage can be controlled to ensure data authentication, tamper resistance, anti-counterfeiting, and prevention of illegal access.
When it comes to information transmission encryption, quantum communication technology has to be mentioned. Quantum communication refers to a new type of communication method that uses quantum entanglement effect for information transmission, mainly involving quantum cryptography communication, quantum remote transmission and quantum dense coding. By applying the key distribution technology based on quantum communication to the key link in the video information encryption, the quantum has the characteristics of entanglement, non-cloning and uncertainty, which can quickly replace the key during the video information transmission process, and then the system video. Information transmission provides greater security. Quantum communication has the security features not found in traditional communication methods. It not only has great application value and prospects in the field of information security such as national security and finance, but is gradually entering the industry. (Author: Zhou Ya)
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Plastic mold casting systems can be divided into three categories according to different types of molds:
(1) Door mold, gate and gate parting line, mold and peeling, the most simple design, convenient processing, and low cost, so more and more people use the door system to operate.
(2) Nozzle mold: The gate and gate line are not divided into types. Usually, a set of nozzle parting line is designed directly in the product design. The design is more complicated and the processing is difficult. The fine nozzle system is often selected according to the product requirements.
(3) Hot runner mold, the mold is the same structure and fine nozzle, the biggest difference is that one or more heat flow, temperature and hot pumping nozzle, but not cold feeding and demoulding, the runner and gate are directly on the product, So the port does not need demoulding, also known as pouring system, this system can save raw materials, suitable for products with expensive raw materials, high demand, difficult mold design and processing, and high cost. The heat flow channel system, also known as the heat flow channel system, is mainly composed of a heat flow channel cover, a heat flow channel plate and a temperature control electrical box. There are two commonly used heat flow channel systems: single-point heat flow channels and multi-point heat flow channels. Using a single-point thermal gate, the molten plastic is injected directly into the cavity with a single thermal gate sleeve. Multi-point hot sprue is used to branch molten material into each hot sprue sleeve and then through the hot sprue plate into the mold cavity