Network security usually refers to the security of computer networks, and in fact it can also refer to the security of computer communication networks. Computer communication network is a system that connects multiple computers with independent functions through communication equipment and transmission media, and realizes information transmission and exchange between computers with the support of communication software. Computer network refers to a system that connects several independent computer systems, terminal equipment and data equipment scattered in the region by means of communication under the control of the protocol for data exchange. The fundamental purpose of computer network is to enjoy resources, and communication network is the way to realize network resources. Therefore, the computer network is secure, and the corresponding computer communication network must also be secure. It should be able to exchange information and enjoy resources for network users.
Network security architecture: X.800 standard recommended by ITU, also known as OSI security architecture, puts forward three elements of network security: security attack, security service and security mechanism.
1. Security attacks are divided into active attacks and passive attacks.
Active attacks, which affect network resources and services, are difficult to prevent and can be detected and perceived by users. They can be divided into four types: forging information, replaying information, tampering with information and refusing service.
Passive attacks are characterized by not affecting network resources and services (such as illegally obtaining users' data), being difficult to be detected and unnoticed by users, and can be prevented by encrypting information.
2. Security services include five types: authentication, access control, confidentiality, integrity, non-repudiation/non-repudiation.
3. The security mechanism mainly includes encryption, digital signature, access control, data integrity, authentication exchange, traffic filling, routing control and notarization.
Network security slogan:
1. Take the information express, please fasten your seat belt.
2. Convenience is born at the fingertips, and safety is in mind.
Network is a double-edged sword, and safe use is the key.
4. The security benefits brought by the network crossing interests are endless.
There are many online "gifts", but there are really few.
6. No free WiFi, no login account password.
7. "Public" regards network security and "refers to" happiness.
8. Do not accept free "gift packages" or lucky "winning prizes".
9. Build the cornerstone of network security and realize the dream of becoming a network power.
10. Network security is national security, and national security is people's security.
1 1. The network connects you, me and him, and security depends on everyone.
12. The network is connected with you, me and him, so we should pay attention to both fraud prevention and theft prevention.
13. Get online safely and grow up healthily. Civilized internet access, flying dreams.
14. Don't download programs from unknown sources or forward harmful information.
15. Master the knowledge of network security and protect the safety of personal information.