Where To Get Great Free Linux Ebooks

Today there is so much information on the internet that you do not know where to start looking for it. The most obvious place to look for information is in search engines. There you enter your keywords and get maybe 1,000,000 web sites related to your keywords?! This is the problem with the internet and probably the main reason why ebooks emerged. Ebooks provide you with concise information about a special topic. You have to pay for most of the ebooks on the web today but there are still some great ebooks available for free, you just have to know where to get them.
Since this blog is about computer security I am going to provide you with mostly security and network related books. If you want to get other free ebooks take a look at Wowio or search Google for “free ebooks.”

Great Linux Ebook Web Site
I recently found a really great web site which has a whole lot of Linux guides (ebooks). Take a look at it. It is called The Linux Documentation Project and their main goal is to provide detailed Linux tutorials. For example if you want to learn about Linux System Administration take a look at this guide. You can choose to download them or read them online.

Another web site at which you might want to take a look at would be Astalavista. They have a whole lot of whitepapers on computer security. Furthermore there are some guides and tutorials provided by users which might interest you.

Tell me what you think about it.

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Learning Python

Our way of living has totally changed over the last years. Now a days almost everything relies somehow on computers, e.g. a clothing shop uses some kind of software to keep track of their clients. Since this is getting more popular there is a stronger need for people who are able to create such software. Because of that I am going to show you how and where you can learn about creating software, i.e. programming. In this case we will use Python as our programming language.
Why Python?
Python is an relatively new programming language compared to C and other languages. Since it is a more modern programming language it is easier to use and does not require that much in-depth understanding. Further it is good to start with because you can see, at least partly, the results of what you programmed immediately.

To get started download the latest version of Python and install it. If you are having problems with setting it up visit the links below or post your problem here and I will get back to you.
Learning Python
To be able to use a programming language you first need to get a basic understanding. For that reason I suggest you read this Python tutorial. If you want to get even more in-depth knowledge feel free to take a look at this article. After having read about Python start to program a little bit. Don’t be frustrated if your program doesn’t work right away, that’s how you actually learn how to program. We learn through mistakes.

Feel free to contact me if you have any questions

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Hacking Web Applications

The internet is growing faster then ever and it will probably will not stop growing in the near future. The same thing applies to web applications. Each day there are thousands of new web applications and they are becoming more and more important. More companies rely heavily on them, for that reason it is a extremely important to secure them properly. By understanding how to hack them you will understand how to secure them.

As with everything, hacking web applications is about experience and knowledge. That is the reason why I want to show you how and where you can learn about it.

Legal Web Hacking sites
There are several good web sites where you can learn about hacking web sites. I do not want to go into detail since I already listed most of them in my first and second part of the learning how to hack article.

Learning Web Hacking Through Programs
If you want to learn to hack web application I recommend you download Webgoat. Webgoat was created by OWASP. You can download it for free on OWASP’s web site. After downloading it you need to extract the zip-file. Then double click on the webgoat.bat file. This makes your computer more vulnerable so I recommend that you unplug your network cable so you do not have access to the internet. Afterwards open up a browser, browse to http://localhost/WebGoat/attack and enter “guest” as username and password. You should now see something similiar to the picture below. On the left side of the page you can select the different things you want to learn. Clicking “Hints”, on the top of the page, will help you with the challenge when you are stuck.

OWASP\'s Webgoat
Have fun ­čśë If you have any questions or you are stuck in a challenge, feel free to contact us.

3 Simple Ways To Prevent Spam

@ email signSpam is a huge problem now a days. Thousands of programs crawl the internet each day looking for email addresses. The problem is that people post their email addresses without thinking about the risk of spam or that they do not know how to protect themselves from spam.

How Do Crawlers Find My Email Address
Finding your email address on your web site is not really complicated. The email crawlers look at your page and every link on it. If they find a link containing an @ sign, they will extract the email address, copy it and go on with their search. This is how these programs work.
Now that we know how they find our addresses we can go on to fixing the problem.

Preventing Spam
The first way to prevent spam is pretty simple. When you post your email address on a page replace the @ sign with an [at] or (at), however you like. This measure will keep away dumb crawlers from extracting your email address. However there are still smart programs which recognize this and will still copy the address and replace the [at] with @.

The second way is to use an image, like the one above. of an @-sign instead of the @ itself.This is an very effective way to prevent crawlers from copying your email but it is tedious. It also increases the size of your homepage and therefore the speed with which visitors will download your web site.

The third way is to encode your email address. There are web sites that offer this service for free. The one I found is an German web site, antispam. I marked the lines you have to fill in on the picture with a short explanation. After filling in the boxes you can go ahead and click “Verschl├╝sseln”. explanationThis should take you to another page.
There the code which you have to copy is presented. It also gives you an preview of how the link will look like on your page. Just copy the code and paste into your web site.
The downside of this method is that this will not work if someone visits your web site who has Javascript disabled.

I hope this helps

Metasploit site hijacked

Supposedly the metasploit web site was hijacked by hackers. The hackers used an ARP poison to pull off the attack. The homepage was defaced and redirected to a page announcing that it was “hacked by sunwear ! for fun.”
For more details take a look at the news site The Register.

Bypassing BIOS password protection

Securing your own computer is very important and most people rely on BIOS passwords to protect their computer. But this is a huge mistake since anyone with a little bit of knowledge is able to bypass it easily.

Bypassing BIOS password protected computers

Most BIOS chips have built-in master passwords or hidden routes which enable you to bypass the password protection in case you lost or forgot your password.

Master passwords
There are several web sites that list all the BIOS master passwords, here is one of them. You can also just google “BIOS master password list” and you will find tons of lists.

It is not guaranteed that these master passwords work because of the different BIOS chips but there is a pretty good chance that they will.

Bypassing it the other way
You can also bypass it if you are already running Windows( I acutally don’t recommend doing this since it can be harmful to your BIOS, only use it if you know what you are doing). Open the command prompt cmd.exe . There enter:
Debug [Enter]
o 70 17 [Enter]
o 71 17 [Enter]
q [Enter]

This will restart the computer.

Taking screenshots under Windows

I recently needed to take screenshots in Windows so I thought I give you an introduction to taking screenshots under Windows. It is really easy so I’m gonna keep it short:

If you want to take a screenshot of the desktop you have to press “Print Screen” on your keyboard. You still don’t have a screenshot since all what Windows does is copy it to the clipboard. Open up Paint and press “Crtl V”. This will paste the screenshot into Paint. Here you have your screenshot.

If you want to take a screenshot of a single window you have to press “Alt Gr Print Screen” and then do the same mentioned above.

I hope this is helpful