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1. Introduction

With increasing popularity of Linux on Internet , more and more security holes are found in the current GNU/Linux system. You may hear from the Internet that --ooh, There are bugs found in Linux, which will cause the system to be easily compromised by hacker.

Since the Linux is an art of open source community, security holes can be found easily and can also be patched quickly. But when the hole is disclose to the public, and the administrator is too lazy to patch the hole. It is very easy to break into the current system and it is worse that the hacker can get the root shell. With the current GNU/linux system, he can do whatever he want. Now, you may ask, what is the problem and what can we do?

1.1 What is wrong with the current GNU/Linux system.

1.2 What is the idea behide LIDS.

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