Kali Linux Password Error

                                        Kali Linux Login Error Solution

Recently installed Latest version of kali linux... Great.....!!!

But what if you are not able to login into your newly installed system.....??? Or if you recently changed your login password but on reboot the system doesnt recognize your password and gives login error....??? or maybe you forgot your login credentials.....

No need to panic or reinstall it again. Here is a solution for your problem. Follow the instruction below and you can get back your system as you wanted it to be. This is a fullproof solution for this kind of problems. Also this same method works for the Backtrack OS. Can't say whether it's a loophole by the Developers or it has been done intentionally. Anyways lets see the method and get back to our system.....

INSTRUCTIONS : 

Step 1 : 
First boot your kali linux and wait  untill the Grub comes to display. Now as you see the grub, simply scroll down to recovery mode using the keyboard arrow keys. Once you have highlighted the (Recovery Mode) then press E.

Step 2 : 
Once you have pressed the E you will see the screen as shown in the image below. 

Here you have to change some words and need to add some sentence as shown in image. After changing it will be like this as in image below...

  
After changing and adding just press F10 or CTRL+X. This will reboot your system.


Step 3 :  
After pressing F10 it will be reboot and you will see this screen, Here you have to type a command passwd root and hit enter. See the image below.

Step 4 :
Then type your new root password, hit enter and again retype your root password and hit enter after that you will see a massage password update successfully.

Step 5 : 
Now power off your laptop/PC power button and switch on it again and login with your new password. Remember that Username is "root" as we have just updated our password.

Congratulations you have successfully updated your password and ready to rock. Enjoy. 
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DoS (Denial of Service )

                                               DENIAL OF SERVICE

Before we start, I just want to publish that this is for education purpose only. DOS attack on a website can make you spend more than 10 years in prison and can cost you a huge amount of money, probably in millions.

So lets start.

Denial of Service (DOS) is used to make a machine or network temporarily unavailable to its intended users. In technical terms, DoS is simply sending large packets of data or null packets to the server /network within a short interval of time (sec.). For example, if you keep sending 1gb of data per sec. (for a some amount of time like 30 mins.) over the network, it will cause the network to overload because of the packets it is receiving in a very small time. This will end up making the website or network to be suspended.

However, you cannot DOS a website with a single computer. Only very small websites may be vulnerable to this. But for taking down a good website requires very large number of computers attacking the website at the same time (DDos).

These type of attacks are very serious and can cause a huge damage to the website or the network. Imagine if a DOS attack is performed on a bank’s website, this could lead to temporarily suspension of the website and thus causing a huge amount of loss to the bank.

In this tutorial I will be teaching you an old yet famous method of DOSing a website,  “ping of death”.  This method floods the OS with overlapping TCP/IP fragments and ultimately causing the OS to crash and resource starvation.  You just need a cmd for this attack. So here you go:

First, open command prompt.

Now, we need to know the IP address of our target website. This can be done by typing

ð  ping www.ourtargetwebiste.com

This will give us the target website’s IP address.

Now, for DOSing the target,  

ð  ping –l 65510 192.168.1.5

Here, 192.168.1.5 is the target website’s IP address. Leave the system for some time to complete the attack.

You can also do this by typing, 

ð  ping –t 0.01 –l 65000

-t is the time (sec.) used to repeat the ping recursively and –l is the packet size. So, Vary these digits in order to make your attack more efficient according to the website. The more the –l and less the –t, the higher will be the attack intensity.

Like I said earlier, this attack cannot be used to turn down a good website. You will need many computer bots to attack such websites. 

There are other tools for DOS attack namely HOIC , LOIC, Slowloris and use of some special Trojans.

If you need any help or you have any suggestion, feel free to contact me.

Hacking is not a crime. Its an art. Use it for good. Don't misuse it. Happy Hacking....!!!  

                                                           Article  By : Varun Sharma