I started something: Softwares

Showing posts with label Softwares. Show all posts

Friday, November 5, 2010

How to run Turbo C (16 bit ) on windows 7 64 bit

One of the biggest problems which students face is to run turbo C in full screen mode. But this is not possible in windows 7 or windows vista.
But one can increase the font size and change the font to let the turbo C get maximized so that one can work on it properly. The method is:-
Run turbo C by typing in run the path of tc.exe

Right click on the top of the TC window and select properties....
Then goto the font option and change the font and fontsize...
Click Ok and the size of the window will be increased...

Problem:-
This method works fine in case of 32 bit windows. But in case of 64 bit windows, it doesn't work.

Solution:-
Solution provided to this is to use XP mode in windows 7.

But there is another problem.....
XP mode requires windows 7 professional or windows 7 ultimate. Most of the laptops purchased by the students come with windows 7 home basic x64. So they can't run the TC on their laptops plus they are unable to use the XP mode. So there is one more way to run TC in full screen.

For this you will need vmware workstation in which we will install XP and use it for supporting the 16 bit applications.

Steps you need to follow:-
First install vmware on your laptop.

After installing, run "VMPLAYER" .

Now create a new XP virtual machine by choosing "Create new virtual machine".
How to create XP virtual machine is given in the link below...
follow the steps provided...

How to install XP in Vm Player

Next power ON the XP machine and login to the machine...
Install all the softwares which are 16 bit and doesnot run on 64 bit machine...
Install Turbo C as well...

Now goto Virtual Machine -> Enter Unity

Now it will be locked as shown....

Minimize the virtual machine....
Now you will notice a new tab will come over the start button when you take your mouse over the start button...

Click on that tab and you will find that the start button of the virtual machine is now also on your desktop.

Now goto run of the virtual machine and provide the path of TC.
It will get displayed in the Host machine..
Now you are able to have 16 bit applications along with the 64 bit OS.

One thing to be noted that you can't run TC in fullscreen mode...
For the first time when you will run TC, ti will be in the fullscreen mode and so it will be minimized to the taskbar. You can't open it at that moment of time.
So you have to select it and press ALT+ENTER to make it to normal view...

Now you will be able to see TC like this....

Now you have to take the above mentioned steps of how to increase the size of the TC by changing the font....

So you will have TC maximized like this....

You can even run gtalk which is 16 bit and can't be run on 64 bit OS.

Try this and you will enjoy it.....

Next time i will write about how to use C in Visual C++.

Thursday, May 27, 2010

SECURITY

In today's world, network security has become an important issue. To hack someones account and to use it is not much difficult today with the use of advanced softwares available in the market which can hack the passwords, can crack the hashes and use them to steal the valuable information.

Various tools can be used for cracking like:-

For windows password cracking, i.e. for logging into someone's account by cracking his password, one can use the free CD available for download called ophcrack. The download link is as given here :-
http://ophcrack.sourceforge.net/download.php?type=livecd
Download the live CD and boot from it. One can easily crack the password of other's computer. It uses the rainbow tables to crack the hashes.

The CD will not work in the same manner for win Vista and XP. For cracking XP passwords download the one for XP and for the vista or win7 download the Vista one.

One can also use cain&abel to crack one's password when he is on LAN. When a computer scans the compuetrs present on the lan, then it sends its NTLM hashes with security info to the other computers . One can trap those hashes and can crack them either using the brute-force mechanism or by using the Rainbow tables. I have cracked the passwords of several computers on the LAN without ever being sitting on those pc's or using them. You can download it from http://www.oxid.it/cain.html

This method of password cracking is highly dangerous for the computers as a hacker can easily log onto the machine if its remote login is enabled as he knows the password and without even letting the others to know about it can easily steal the information. I have not shared the advanced information of cracking using cain but if someone is interested, he can contact me and i can send him the data.

Now the steps how one can neglect all these attacks:-

1. The ophlive cd uses the prebuilt rainbow tables and sometimes uses the bruteforce attack, but one can avoid this attack by including special symbols in their passwords. This CD doesn't work when the password contains special symbols as it doesn't have th rainbow tables for the same.

2. Use of long passwords, greater than or equal to "eight" also helps in denying the attackers. The figure 8 is important because if the password is less than 8 characters , then the computer stores it in the form of LM hashes, which are easy to break, but if it uses 8 or more characters, then it uses the NTLM hashes to store them which are more secure than the LM hashes.

3. For email accounts, always use strong passwords, which include special symbols, alphabets,numbers. The reason for using all these is that when using all these, the number of password combinations become very large, and to develop a rainbow table for them takes a lot of time, in months and years. So its very difficult or impossible to crack password in this case.
Use passwords like the beginning letters of a phrase or statement which is easy to remember like
odiwgjidc (one day i will get job in dream company)
now this password is not even found in dictionary and is very difficult to break.

4. Try to avoid the dictionary alphabets. They can be easily broken by bruteforce attack....

5. Change your passwords frequently and don't use same passwords for different accounts...

For more details you can view the ppt which i have uploaded and the link is provided here...
http://www.slideshare.net/rahulsharmaait/password-cracking

do give your feedback and suggestions... Hope you have liked it.....

Thank you...