What cannot provide security protection in a computer security network environment is the "correctness of the semantic meaning of the information." Fundamentally speaking, network security technology is to achieve the security goal of ensuring the storage, processing and transmission of information in the network environment by solving problems in network security; therefore, in a computer secure network environment, it can provide information carriers, Information processing and transmission, information storage and access provide security protection, but it does not provide security protection for the correctness of the semantic meaning of the information.
The operating environment of this tutorial: Windows 7 system, Dell G3 computer.
What cannot provide security protection in a computer security network environment is the "correctness of the semantic meaning of the information."
The purpose of establishing a computer network is to provide a good communication platform for computer systems that process various types of information. The network can provide an efficient, fast and secure communication environment and transmission channel for the acquisition, transmission, processing, utilization and sharing of computer information. Fundamentally speaking, network security technology is to achieve the security goal of ensuring the storage, processing and transmission of information in the network environment by solving existing problems in network security. Therefore, a computer secure network environment can provide security protection for information carriers, information processing and transmission, and information storage and access. However, it does not provide security protection for the correctness of the semantic meaning of the information.
Computer network security technology
In terms of technology, computer network security technology mainly includes real-time scanning technology, real-time monitoring technology, firewalls, integrity inspection and protection technology, and virus conditions Analysis reporting technology and system security management technology. Taken together, the following countermeasures can be taken at the technical level:
1) Establish a safety management system. Improve the technical quality and professional ethics of personnel, including system administrators and users. For important departments and information, it is a simple and effective method to strictly perform virus checks on startup and back up data in a timely manner.
2) Network access control. Access control is the main strategy for network security prevention and protection. Its main task is to ensure that network resources are not illegally used and accessed. It is one of the most important core strategies to ensure network security. Access control involves a wide range of technologies, including network access control, network permission control, directory-level control, attribute control and other means.
3) Database backup and recovery. Database backup and recovery are important operations for database administrators to maintain data security and integrity. Backups are the easiest and most accident-proof way to restore a database. Recovery is the use of backups to restore data after an accident. There are three main backup strategies: backing up the database only, backing up the database and transaction log, and incremental backup.
4) Apply cryptographic techniques. The application of cryptographic technology is the core technology of information security, and cryptographic means provide a reliable guarantee for information security. Password-based digital signatures and identity authentication are currently one of the most important methods to ensure information integrity. Cryptographic technologies mainly include classical cryptography, single-key cryptography, public-key cryptography, digital signatures, and key management.
5) Cut off transmission channels. Thoroughly disinfect infected hard drives and computers, do not use U disks and programs of unknown origin, and do not download suspicious information from the Internet at will.
6) Improve network anti-virus technical capabilities. Perform real-time filtering by installing a virus firewall. Conduct frequent scanning and monitoring of files in network servers, use anti-virus cards on workstations, and strengthen network directory and file access permission settings. In a network, restrict the files that are allowed to be executed only by the server.
7) Develop and improve a highly secure operating system. It is safer to develop an operating system with high security and not provide a breeding ground for viruses.
Security Management of Computer Networks
The security management of computer networks depends not only on the security technologies and preventive measures adopted, but also on the management measures it takes. and the intensity of enforcement of computer security protection laws and regulations. Only by closely combining the two can computer network security be truly effective.
The security management of computer networks includes security education for computer users, establishing corresponding security management institutions, constantly improving and strengthening computer management functions, and strengthening computer and network legislation and law enforcement. Strengthening computer security management, strengthening users' laws, regulations and moral concepts, and improving computer users' security awareness are very important measures to prevent computer crimes, resist hacker attacks and prevent computer virus interference.
This requires continuous legal education for computer users, including computer security law, computer crime law, confidentiality law, data protection law, etc., clarify the rights and obligations that computer users and system managers should perform, and consciously abide by legal information systems principles, the principle of legal users, the principle of information disclosure, the principle of information utilization and the principle of resource restriction, consciously fight against all illegal and criminal activities, maintain the security of computers and network systems, and maintain the security of information systems. In addition, computer users and all staff should also be educated to consciously abide by all rules and regulations established to maintain system security, including personnel management systems, operation maintenance and management systems, computer processing control and management systems, and various Information management system, computer room security management system, dedicated aircraft and strict division of labor and other management systems.
Physical level of computer network
To ensure the safety and reliability of the computer network system, it is necessary to ensure that the system entity has safe physical environment conditions. This safe environment refers to the computer room and its facilities, which mainly include the following:
1) Environmental conditions of the computer system. The safe environmental conditions of computer systems, including temperature, humidity, air cleanliness, corrosion, insect damage, vibration and shock, electrical interference, etc., must have specific requirements and strict standards.
2) Selection of computer room site environment. It is very important to choose a suitable installation location for your computer system. It directly affects the security and reliability of the system. When choosing a computer room site, pay attention to its external environmental safety, geological reliability, site resistance to electromagnetic interference, avoid strong vibration sources and strong noise sources, and avoid being located on the lower floors or next door to high-rise buildings and water-using equipment. Also pay attention to the management of entrances and exits.
3) Security protection of computer room. The security protection of the computer room is the security measures and countermeasures taken against physical disasters in the environment and to prevent unauthorized individuals or groups from destroying, tampering with or stealing network facilities and important data. In order to achieve regional security, first of all, physical access control should be considered to identify the identity of access users and verify their legality; secondly, visitors must limit their scope of activities; thirdly, the peripherals of computer system center equipment must be Multi-layer security protection circle to prevent illegal violent intrusion; the building where the fourth equipment is located should have facilities to withstand various natural disasters.
Computer network security is a complex system engineering involving many factors such as technology, equipment, management and system. The formulation of security solutions needs to be grasped as a whole. Network security solutions integrate various computer network information system security technologies, integrating secure operating system technology, firewall technology, virus protection technology, intrusion detection technology, security scanning technology, etc., to form a complete and coordinated network security Protection system. We must pay equal attention to management and technology. Security technology must be combined with security measures, strengthen computer legislation and law enforcement, establish backup and recovery mechanisms, and formulate corresponding security standards. In addition, since computer viruses, computer crimes and other technologies do not respect national boundaries, sufficient international cooperation must be carried out to jointly deal with the increasingly rampant computer crimes and computer viruses.
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