TECH-it-GEEK

W e have seen what is Cryptography and use of cryptography . In this article we will learn more about Computer Security. We will see and learn about term 'Steganography'. We also going to see some useful free steganography tools available on internet. Se let's start. WHAT IS STEGANOGRAPHY? S teganography is a technique or art of hiding a secret message within an ordinary message and extraction of original secret message at destination. Steganography uses cryptography algorithms to hide an encrypted message so that no one suspects it exists. Ideally, anyone scanning your data will fail to know it contains encrypted data. HOW STEGANOGRAPHY WORKS: I n modern digital steganogarphy, data is first encrypted by cryptography algorithms and then inserted, using a special algorithm, into redundant data that is part of a particular file format such as a images or Audio file formats - bmp, JPEG, mp3 etc. Following figure shows how it exactly works. As shown in figure, ...

W ant to block particular website from accessing other users? Then this article might help. This is just a simple technique and therefore do not require specialized software to block a website. You just needed an User Account with Administrative control on your Windows XP, 7 or 8. We need administrative account because we are going to modify a system file i.e. Hosts File. Basically Hosts file is a plain text computer file used in your Windows Operating System that maps hostnames to Internet Protocol (IP) addresses. So without going much into details let's look how it works. HOW TO BLOCK WEBSITE USING HOST FILE Things to do before modifying Host file: 1. Log in into your Admin a/c 2. Turn of your Internet Connection temporarily. 3. You may have to disable your Anti-Virus as well. Now let's actually modify the Host file. In Windows XP: 1) Go to "My Computer" → C drive → Windows → System32 → drivers → etc. 2) You will see the file named as hosts (wi...

I n this article we will talk about what is domain name system and what exactly it does. So let us start. Domain Name: D omain name is an unique name used to identify website on internet. There rules and procedures are defined in Domain Name System i.e DNS. Any name registered in the DNS is a domain name. Domain names are case-insensitive, so com, Com, and COM mean the same thing. A full domain name is a sequence of labels separated by dots (.). Domain Name System (DNS): D omain Name System is an invention of a hierarchical, domain-based naming scheme and a distributed database system for implementing this naming scheme. It is primarily used for mapping host names to IP addresses but can also be used for other purposes. DNS Provides the protocol that allows the client and servers to communicate with each other. Name Space: I n DNS Name Space is structured as a tree, with domain names referring to nodes in the tree. The tree has a root, and a fully-qualified domain name i...

Computer Virus Definitions: → A computer virus is a program which attach itself to another program and causes damage to the computer system or to the computer network. More formal definition for computer virus would be-"It is a program or piece of code that is loaded onto your computer without your knowledge and runs against your wishes." What virus can do with your system? → T hese viruses work without the knowledge of the users and spread from one computer to another through the network, Internet or removable devices like CDs and USB drives. They can then steal your valuable & confidential or sensitive data (eg., Passwords, Databases, Credit card information, etc), may be delete or corrupt them, virus can provide remote access to attacker, monitor your activities. Who create the computer viruses? → A ll computer viruses are man made. Any one who having good knowledge about programming language (like C, C++, VB, pascal, etc) can write a virus cod...

→What is "Chrome Remote Desktop"? C hrome R emote D esktop is a remote desktop software tool developed by Google that allows a user to remotely control another computer using a Chromoting protocol developed by Google. It transmits the keyboard and mouse events from one computer to another, relaying the graphical screen updates back in the other direction, over a network. →How to use it? You will need following tools to use it: Windows or MAC running PC. Google chrome browser. Android phone which running on Android 4.0 (Ice-cream sandwich). Follow the steps below to make it work: → First you have to download Chrome Remote Desktop add-on for your chrome browser. Download it by clicking here and install it. → Now download chrome remote desktop an Android app from play store on your android smartphone. Click here download it and install it. → Now open your google chrome browser → go to Apps → click on Chrome Remote Desktop. (Make sure you are sign i...

D isk partitioning is to partition or divide your hard disk drive (HDD) into several local logical disks. There are many effective methods to do it. Today we are going to use one of the effective method which is " Partition using Windows Disk Management ". I'm currently using Windows 8 do it but you can use same method on your Windows XP or Windows 7. So, lets start... (Warning: Before partitioning your hard drive please make a backup of your important data. I'm not responsible if you done anything wrong. Please follow the steps carefully.) Step 1: Open " Computer Management " tool. To open it go to the desktop. Right click on your " Computer " icon and then click " Manage ". Step 2:  Now go to " Disk Management " under the " Storage ". You will see all of your partitioned and removable drives. Step 3:  Choose the drive which you want to divide. Here I'm going to Partition my D drive. Ri...

Y ou may have aware of this virus for sure. This virus converts all your files and folder stored in your removable disks like pen drive, memory card, etc. into shortcut icons. This virus just hide all your files and folders and will show shortcuts of these files and folders. So there is way to retrieve your all valuable data without deleting of any files or loss of the data. We are going to use command prompt to solve this issue. Infected file or folder will look like this- Infected folders Follow the steps bellow to recover your data: Please connect your infected removable drive (Pendrive). Make sure it is detected on your PC. Click on " Start "   and enter " Run " . Now type " cmd "  and click " Ok ". Now enter this command: attrib -h -r -s /s /d g:\*.* ( Note: I'm assuming your Pendrive as G. If your drive letter is not G then replace g with that letter. ) Now press "Enter" . That's it, all don...

In this article I'm giving you some important tips, points to buy a new graphics card. So, lets start.  What is Graphics Card? Ans: In simple words a graphics card also called as video card, video adapter, etc. is an expansion card which help in rendering of 3D scenes and 2D graphics, MPEG-2/MPEG-4 video decoding, TV output, or the ability to connect multiple monitors. A Graphic Card What is Gaming? Ans: Video gaming is a today's popular media culture that has influenced by video games. It is very popular in today's generation. Everyone has dream to play hardcore games like Grand Theft Auto (GTA), Battlefield, Call of Duty, assassin's creed, etc series games. To play these games we need to buy a dedicated video card which can fulfill our gaming habits. Why should we have to buy a dedicated graphics card? Ans: Today's motherboards and processors provides inbuilt graphics capability. The best example of inbuilt graphics adapter is Intel...