What is the use of authentication in linux?

Authentication in Linux is the process used to verify a user's identity and authorize them to access system resources. Its functions are: 1. To ensure that only authorized users can log in and use system resources; 2. To prevent unauthorized users from accessing system and ensure that only users with legal identities can operate; 3. Provides management and control functions for user accounts; 4. Can track and record user login and operation activities for security auditing and troubleshooting.

The operating system of this tutorial: Linux5.18.14 system, Dell G3 computer.

In Linux, authentication is the process used to verify a user's identity and authorize them to access system resources.

It has the following important purposes:

1. Access control: Authentication is a way to ensure that only authorized users can log in and use system resources. Through user name and password verification, the system can confirm the user's identity and grant access to specific files, directories, services, and functions based on their permission level.

2. Security: Authentication is a key measure to ensure system security. Through user name and password verification, you can prevent unauthorized users from accessing the system and ensure that only users with legal identities can operate. This helps prevent security threats such as malicious attacks, data breaches, and unauthorized changes.

3. Account management: Authentication provides management and control functions for user accounts. It allows administrators to create, modify and delete user accounts, and set password policies, permission levels and access restrictions. Through authentication, administrators can effectively manage user accounts and ensure the stable and safe operation of the system.

4. Tracking and auditing: Authentication can track and record user login and operation activities for security auditing and troubleshooting. Through the authentication system, administrators can obtain user login logs and operation history to understand who accessed the system when and what operations were performed, providing important information for investigation and analysis of security issues.

In short, Linux authentication is an important mechanism to ensure the legality of user identities and system security. It allows legitimate users to access system resources and restricts unauthorized access. Through authentication, administrators can effectively manage user accounts, maintain system security, and monitor and audit system access and operations.

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