When you try accessing a secure website sometime you get this warning message.

There is a problem with this website’s security certificate. The security certificate presented by this website was not issued by a trusted certificate authority.

Security certificate problems may indicate an attempt to fool you or intercept data you send to the server.
We recommend that you close this webpage and do not continue to this Web site.

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This is a step by step guide for securing your Linux Systems.

Linux is just another operating system like Windows, Mac, BSD etc. Linux by default is not secured enough compared to Windows which is not secured by default at all. Charalambous has decided to write this paper to give a security prospective on the steps required to build a secure Linux System.

There is no such thing as a perfect or a completely secured operating system. The purpose of this paper is to understand how you can at least provide some kind of security to your system.

Credit:

The information has been provided by Charalambous Glafkos.
The original article can be found at:

http://www.infosec.org.uk/media/archive1/papers/Securing_&_Hardening_Linux_v1.0.pdf

Three main types of computer viruses.

• A true Virus: a program that attempts to cripple your computer by “infecting” key files and spreading itself on to others. It might change critical files or perform unwanted functions like erasing your hard drive.
• A Trojan Horse will leave your computer accessible for other people to use (a common Trojan Horse is Back Orifice). Once a Trojan Horse is installed it may “bounce” through your machine as a way to cover its tracks and do other damage. A Trojan Horse gives the hacker access to all the information stored on your hard drive, so he can read your files & personal information, or use your pc to store data, send email, etc.
• A Worm will travel from system to system, gather information and send it on, also doing collateral damage along the way.

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Reports said that user’s who update to the latest service pack 3 lost entries in their systems registry. Some users found that their network cards had mysteriously deleted after the update. Symantec denied that this is caused by their NIS and Norton 360. So before updating your system you need to backup including the registry. Proceed with caution.

“The Network Connections screen now does not show any of the NIC cards. I have three adapters that used to show up,” said someone using “MRFREEZE61″ as an alias on Microsoft’s XP SP3 support forum on May 7. “In an attempt to troubleshoot, I tried to bring up the Device Manager, and to my surprise it is now empty.”

Numerous other users corroborated MRFREEZE61’s account on the same support thread.

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