Archive for the ‘My Posts and Articles’ Category

This article introduces steganography and explains some of its techniques and methods supported by examples. My objective was to make this post as short as possible while covering all important information. Your comments are welcome for any possible enhancements or for future articles about steganography by me or other people.
I have also posted this to HackThisSite.org articles.

Steganography

Steganography is all the techniques used to exchange secret messages without drawing attention. It is the science of hiding information. Read the rest of this entry »

JavaScript codes can be injected in the address bars of web browsers to edit online forms before submitting them, bellow I am posting an example for archiving purposes.

Assuming the page has a contact form, where submitted data is sent to an email address included in a hidden HTML input tag as in the following code:

…
<form name="ContactForm" action="submit.php" method="post">
<input type="hidden" name="Email" value="admin@website.com" />
…
</form>

To change the email address to: myemail@hotmail.com, the following code can be injected:

Read the rest of this entry »

Your browser’s address bar (URL bar) can be used to inject JavaScript code directly into the webpage you are visiting without reloading the page. The following codes are useful to do cookie editing:

First, visit the targeted webpage and inject the following code to view realted cookie’s fields and the values assigned to them.

javascript:alert(document.cookie);

Second, to edit a certain value use:
Read the rest of this entry »

Hubs, Bridges, Switches and Routers are used to build networks. If you are trying to design your own LAN (Local Area Network) at home, then you probably need to know what they do and the main differences between them. I will try to cover all that in addition to some networking details to cultivate the article and provide better understanding of how the internet works. After all, always remember that the internet as you know it is nothing more than a network of networks!

Read the rest of this entry »

This article covers an important limitation of FAT32 and introduces exFAT as an alternative along with a small history of the File Allocation Table (FAT) file system.

It is the oldest file system for Windows OS and is mainly designed for removable media. It first came out as FAT12 (12 refers to the size ‘in bits’ of the FAT entries in the actual FAT structure), and by the time as the storage media size increased, more types were developed to increase the number of bits, so we got FAT16, FAT32 and finally exFAT (Extended FAT aka FAT64).

While, FAT12 was designed for small media at its time such as Floppy Disks, exFAT was introduced by Microsoft to best suit USB Flash Drives now a day.

FAT is good for removable media because it is considered to be a light-weight file system due to its simplicity (e.g. it was not designed to support security or access rights). Nevertheless, FAT can be recognized by outdated systems, for instance, FAT12 and FAT16 are recognized by all operating systems from MS-DOS forward and FAT 32 from Windows 98 forward.
FAT16, FAT32 and exFAT may be used for Hard Disks for storage purposes or even for Windows installation, but this will be on the price of losing NTFS benefits. However, Win98 does not support NTFS, so its case is different. Read the rest of this entry »

To enter BIOS you first need to restart your computer and read the BIOS entering setup message to follow the instructions, because what you need to press varies from one computer to another.

For a reason or another, some computers are configured to show a Logo or a picture on start up instead of the usual setup message. When that logo shows up, press Esc or Tab to remove it.

If your computer does not pause enough time to read your BIOS entering setup message., you may pause the screen by pressing the Pause/Break key on your keyboard. Press any key afterwords to unpause your computer.

Here is a code to detect weather the visitor if your webpage is using ie or not:

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if (isset($_SERVER['HTTP_USER_AGENT']) && 
    (strpos($_SERVER['HTTP_USER_AGENT'], 'MSIE') !== false)) 
	{
	echo "You are using ie";
	}  
	else { 
	echo "You are not using ie"; 
	}

I am using this simple PHP code while developing HybridPass, a new authentication tool for web applications. My Javascript is only compatible with ie at the moment, so until I develop it more to support other browsers it is important to give my visitors the right feedback.

array_rand can be used to select a list of values randomly. This helped me to code a server side script to display a random grid of pictures as part of a project. These pictures changes every time the page is requested or refreshed.

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Who doesnt need to implement a data validation technique along with every online form?

Bellow is a basic javascript code to check that no form is submitted with empty fields:

Read the rest of this entry »