EvilZone

Hacking and Security => Reverse Engineering => : Raavgo July 10, 2013, 12:11:05 PM

: [Problem][Java] Need help to reverse the Password of this programme
: Raavgo July 10, 2013, 12:11:05 PM

This Programme has a password within it and I am unable to crack it.The access is only protected through a 6-digit code which is checked on clientside.


This is part of a wargame and I am unable to solve it at the moment but I am eager to learn maybe someone wants to set me on the right part.


regards
Raavgo

: Re: [Problem][Java] Need help to reverse the Password of this programme
: Deque July 10, 2013, 01:00:53 PM

Get JAD: http://varaneckas.com/jad/

Look for the .jar file that has the main Java code. I guess it's Client.jar.
Unzip it.
Put the .class files into the same folder as jad
Run ./jad *.class

You will get a bunch of .jad files which is the decompiled Java code. Read them and look for the password.

: Re: [Problem][Java] Need help to reverse the Password of this programme
: Raavgo July 10, 2013, 01:05:40 PM

Already did that stuff :( just don't get through the source code
the password is encoded within the programme

: Re: [Problem][Java] Need help to reverse the Password of this programme
: bluechill August 21, 2013, 01:35:28 AM

: Raavgo  July 10, 2013, 01:05:40 PM

Already did that stuff :( just don't get through the source code
the password is encoded within the programme

If the password is checked client side, then that means it is either created/calculated or stored within the program, you just have to find that location.

Also, I recommend: http://java.decompiler.free.fr/?q=jdgui for a java decompiler.