Protecting a file

[Covert2String]

Hi there, this time I have a more complex question <!-- s --><img src="{SMILIES_PATH}/icon_e_biggrin.gif" alt="" title="Very Happy" /><!-- s --> .
I need to protect my application. If anyone could explain me how I can avoid external manipulation of my app (I'd need a whitelist, though). This is really important! <!-- s:| --><img src="{SMILIES_PATH}/icon_neutral.gif" alt=":|" title="Neutral" /><!-- s:| -->

Thanks in advance

Edit: The best thing I can think is something that completely blocks manipulation like injecting a dll to the .exe and then a simple blacklist.

[xolara]

Do you want to write a code that will protect you or do you want an encryption so you can't de-compile your program by other people?

[Covert2String]

I want to protect the application. So it can't be injected any dll to the app.

Edit: Forgot to mention that I don't have the source code of the executable which I'm trying to protect. So what I need is kind of importing the exe and making a new one.

[brandonio21]

As far as injecting goes for a desktop application, I am pretty sure that it's not that big of a problem. Now if you were developing a web application, or something that constantly relays with a SQL server of some sort, then this would be of top priority.

A quick Google search on the topic turned up with close to no results. I really don't think you're at that much of a risk for .dll injection.

However, anyone can decompile a program if it has no encryption or obfuscation on it, but I don't think that's what you're looking for.

[Covert2String]

I'm trying to.protect a game exeutable. So.i needtoimport it an generate anew file from it which is protected againts injection