Commonly used network security technologies include: network firewall technology, anti-virus software technology, file encryption and digital signature technology

1. Firewall

Network firewall technology is a It is a special network interconnection device used to strengthen access control between networks, prevent external network users from entering the internal network through illegal means, access internal network resources, and protect the internal network operating environment. It checks the data packets transmitted between two or more networks such as link methods according to certain security policies to determine whether communication between the networks is allowed and monitors the network operating status. ?

Current firewall products mainly include bastion hosts, packet filtering routers, application layer gateways (proxy servers) and circuit layer gateways, shielded host firewalls, dual-homed hosts, etc. ?

Although firewalls are currently an effective means of protecting networks from hacker attacks, they also have obvious shortcomings: they cannot prevent attacks through other means other than firewalls, and they cannot prevent internal defectors and inadvertent users. It cannot completely prevent the transmission of virus-infected software or files, and cannot protect against data-driven attacks.

Since the American Digital Company installed the world's first commercial firewall system on the Internet in 1986 and proposed the concept of firewall, firewall technology has developed rapidly. Dozens of companies at home and abroad have launched firewall product series with different functions.

The firewall is at the bottom of the five-layer network security system and belongs to the category of network layer security technology. At this level, the question that enterprises ask about the security system is: Can all IPs access the enterprise's internal network system? If the answer is "yes", it means that the enterprise's intranet has not taken corresponding precautions at the network layer. measure.

As the first barrier between the internal network and the external public network, the firewall is one of the first network security products to receive people's attention. Although theoretically, firewalls are at the bottom of network security and are responsible for security authentication and transmission between networks. However, with the overall development of network security technology and the continuous changes in network applications, modern firewall technology has gradually moved beyond the network layer. Other security levels must not only complete the filtering tasks of traditional firewalls, but also provide corresponding security services for various network applications. In addition, there are a variety of firewall products that are developing in the direction of data security and user authentication, preventing viruses and hacker intrusions.

According to the different technologies used by firewalls, we can divide them into four basic types: packet filtering type, network address translation-NAT, proxy type and monitoring type.

2. Anti-virus software technology

Anti-virus software is definitely the security technology solution that we see the most and is the most commonly used, because this technology is the simplest to implement, but we all We know that the main function of anti-virus software is anti-virus, but its functions are very limited and cannot fully meet the needs of network security. This method may still meet the needs of individual users or small businesses, but if individuals or businesses have e-commerce needs, it cannot fully meet their needs. The good news is that with the continuous development of anti-virus software technology, current mainstream anti-virus software can also prevent the intrusion of Trojans and other hacker programs. Some anti-virus software developers also provide software firewalls, which have certain firewall functions and can function as hardware firewalls to a certain extent, such as KV300, Kingsoft Firewall, Norton Firewall, etc.

3. File encryption and digital signature technology

Security technologies used in conjunction with firewalls also include file encryption and digital signature technology, which are used to improve the security and safety of information systems and data. Confidentiality is one of the main technical means used to prevent secret data from being stolen, intercepted or destroyed by outsiders. With the development of information technology, network security and information confidentiality have attracted increasing attention. At present, in addition to strengthening the security protection of data legally and administratively, various countries have also taken technical measures in terms of software and hardware to promote the continuous development of data encryption technology and physical prevention technology. According to different functions, file encryption and digital signature technology are mainly divided into data transmission, data storage, data integrity identification and