This is a very simple problem ( to be frank this is nothing )
Here is the question :
You need to authenticate with the guard to gain access to the loading bay! Enter the root password from the vault application to retrieve the passkey! This class file is the executable for the vault application.
This sum makes us to think in the way of reverse engineering :). We are given a “.class ” file and we need to find the password from the code
If you have a look at the hint, it says that you need a Decompiler to get the Java code and it gives an example as JD-GUI.
Yeah, you can install any application based on your wish in your system as this is a simple question anything will work fine
You can Decompile the file online without any application from this website http://www.showmycode.com/
You will get a zip file from the website, I think everyone know how to extract a zip file
Just upload the class file to the website and you get the code in a mater of seconds , You need not know Java to solve this problem (I too don’t know what Java is :P)
But if you look at the code you will understand that the password is AoJkVhLwUR