With the rapid development of network technology, network security becomes a hot topic. Network security means that all network system hardware, software and information shouldn’t be damaged, modified or leaked out because of accidental or malicious reasons. In this way, the system will run continuously and normally, the network service will not be interrupted and the information security can be greatly ensured. Network security includes network device security, network information security, network software security, and so on.
Network security types
According to different environment and applications, there appear four main network security types.
Network security type one: system security
Admittedly, the security of operating system is the basis of information security and transmission security. System security focuses on the normal running of operating system in order to avoid the damage and loss of messages which have been stored, processed and transmitted by system.
Network security type two: network environment security
This kind of network security includes various aspects: user password authentication, user access permission control, data access permission and mode control, audit policy, computer virus prevention, data encryption, etc.
Network security type three: information transmission security
Information transmission security actually refers to the secure information transmission result. It focuses on the prevention of bad results caused by the transmission of illegal and harmful information.
Network security type four: information content security
To be specific, information content security focuses on the confidentiality, authenticity and integrity of information. The essential purpose of this kind of network security is to protect users’ interests and privacy.
Threats to network security
At present, there is a lot of different information on the internet. Some of them are very sensitive; some of them are very valuable. Because of that, many hackers choose to steal computer users’ information to do great harm to information security so as to gain high profits. In addition to this, there are many other threats to network security.
- Infiltrated threat and implanted threat: infiltrated threat mainly includes counterfeiting, bypass control and authorization violation, while implanted threat mainly includes Trojan and trap door.
- Network structure: network has three basic topology structures: star, bus and ring. Before the establishment of a unit’s internal network, all departments may have built up their own local area network with different topology structures. Therefore, in order to communicate between heterogeneous networks we often construct the internal network at the expense of some security mechanism settings.
- Network protocol: in order to save money, users will definitely protect the existing network infrastructure during the construction process of internal network. Besides, in order to survive, many network companies have a high requirement in network protocol compatibility. This brings benefits as well as security risks to users and manufacturers.
- User factor: Enterprises build their own internal network in order to speed up the exchange of information and better meet the market demand. After creation, the user scope is bound to expand from employees to customers and people who want to learn more about this enterprise. The increase of user will have an impact on the emergence of commercial espionages or “hackers”, posing a huge threat to network security.