<div>
<div class="content wysiwyg-content">
I have a problem on my server is that any one can open other account files so I get some account hacked by same person I would like to prevent that <br />
my server info : <br />
centos 5.2 <br />
centos <br />
php 2.5.6 <br />
mysql5 <br />
<br />
please help me to find a full solution for this issue <br />
thank you 
</div>
</div>


I have a problem on my server is that any one can open other account files so I get some account hacked by same person I would like to prevent that 
my server info : 
centos 5.2 
centos 
php 2.5.6 
mysql5 

please help me to find a full solution for this issue 
thank you 

how to prevent some one open other account files

Operating system security (OS security) is the process of ensuring OS integrity, confidentiality and availability. OS security refers to specified steps or measures used to protect the OS from threats, viruses, worms, malware or remote hacker intrusions. OS security encompasses all preventive-control techniques, which safeguard any computer assets capable of being stolen, edited or deleted if OS security is compromised, including authentication, passwords and threats to systems and programs.

OS Security

The Linux operating system, in all its flavors, has its own share of security flaws that allow intrusions, but there are various mechanisms by which these flaws can be removed, generally divided into two parts: authentication and access control. Authentication is responsible for ensuring that a user requesting access to the system is really the user with the account, while access control is responsible for controlling which resources each account has access to and what kind of access is permitted.