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By Shadab Siddiqui
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Additional resources for Linux Security (Networking)
Sample text
This can provide you a vital clue about the intrusion. Linux is very stable. You don’t need to reboot a Linux computer often except in situations such as when you upgrade the OS or change the password. If you reboot the computer after changing the OS or upgrading the hardware, you will be well aware of the date and time you did that. Therefore, you can easily get an indication of intrusion if you notice that the computer was rebooted at an unusual time. 19 20 Chapter 2 LINUX SECURITY: AN OVERVIEW Check for physical signs of tampering, such as scratches or the shifting of the monitor or CPU from their original positions.
A user cannot access the home directory of another user. You should be very careful while you are logged on as a root user. Consider a situation in which you accidentally delete some critical system files. Therefore, you should log in as root only when you need to perform root-specific tasks. For performing the routine tasks, you should log on as a normal user. ACCOUNT SECURITY Chapter 2 Password Security When selecting passwords, it is important to select ones that are not easy to guess. A company should have standard guidelines for passwords.
BIOS manages the communication between the operating system and the hardware devices attached to the computer. BIOS enables you to protect your computer. It does this by enabling you to specify a boot password. A user needs to provide this password in order to boot and log on to your system. However, the security provided by BIOS is very weak and can be easily breached because you can reset or remove the BIOS. Some BIOS makers provide default passwords with BIOS. These passwords are known to the hackers and they can easily boot your system if you haven’t changed the default password.