Four essentials for protecting Linux System Security

I. Enhanced security protection tool SSH is short for the Secure Sockets Layer. It is a set of program groups that can be safely used to replace public programs such as rlogin, rsh, and rcp. SSH uses public key technology to encrypt the communication information between two hosts on the network, and uses its key as an authentication tool. Because SSH encrypts information on the network, it can be used to securely log on to a remote host and transmit information between the two hosts securely. In fact, SSH not only ensures secure communication between Linux Hosts, but also allows Windows users to Securely connect to Linux servers through SSH. 2. Keep the latest system core because there are many Linux circulation channels and updated programs and System Patches frequently appear. Therefore, to enhance system security, you must update the system kernel frequently. Kernel is the core of the Linux operating system. It is used to load other parts of the operating system and implement the basic functions of the operating system. As Kernel controls various functions of the computer and network, its security is crucial to the security of the entire system. Many well-known security vulnerabilities exist in earlier versions of Kernel, which are also unstable. Only versions 2.0.x and later are stable and secure, and the running efficiency of the new versions is greatly improved. When setting the Kernel function, you only need to select the necessary functions. Do not accept all functions as per your order. Otherwise, the Kernel will become large, occupying both system resources and leaving hackers with an opportunity. There are often the latest security patches on the Internet. Linux administrators should be well-informed and often patronize Security newsgroups to check new patches. 3. Set the security level of the user account. In addition to the password, the user account also has a security level, because on Linux, each account can be assigned different permissions, therefore, when creating a new user ID, the system administrator should grant different permissions to the Account as needed and merge them into different user groups. 4. restrict the power of Super Users we mentioned earlier that root is the focus of Linux protection. Because of its unlimited power, it is best not to authorize super users easily. However, the installation and maintenance of some programs must require Super User Permissions. In this case, other tools can be used to grant these users the permissions of some super users. Sudo is such a tool. The Sudo program allows a general user to log on again with the user's own password after the configuration is set, to obtain the permissions of the Super User, but only a limited number of commands can be executed.