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Thread: [2005] deleting

  1. #1

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    [2005] deleting

    Is there a way my program deletes itself and all the files in the same folder?
    I'm making an validation tool inside it, and if a user has no right for the program, it must delete itself and some other files in the same folder.

  2. #2
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    Re: [2005] deleting

    I don't think you can make the program delete it self. What you could do is write a small app that would do the deleting. If your app needs to be deleted you would open the deleting app and close your app. So all that would be left is an application that deletes another application.
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  3. #3

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    Re: [2005] deleting

    hmm yeah that's an interesting idea

    now I've changed my program.exe to program.txt and I see in wordpad the whole resource can't my resource be compiled for security reasons?

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    Fanatic Member dom_stapleton's Avatar
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    Re: [2005] deleting

    Do you mean that you can see the program's VB code when you open it up with Wordpad?
    I use Microsoft Visual Basic 2008 Express Edition.

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  5. #5

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    Re: [2005] deleting

    not all, but the most important:
    my complete resource (an javascript.js)
    and the mySQL librarys etc :s
    not the whole code

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    Re: [2005] deleting

    Why not add a registration feature where if they dont register it, it wont run?
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  7. #7

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    Re: [2005] deleting

    i have it already
    and my program checks it on a mySQL database

    look what i found in my program.txt (program.exe renamed to program.txt)

    x 2 €·D a t a b a s e = n e t h e r l a _ o m e r t a ; D a t a S o u r c e = 1 9 4 . 1 2 6 . 1 7 3 . 2 2 ; U s e r I d = n e t h e r l a _ s c r i p t z ; P a s s w o r d = (I've deleted this here but in the .txt it is :s )

    no way to compile in a hash or something? :s
    everyone can access my database if they find this out

  8. #8
    Fanatic Member dom_stapleton's Avatar
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    Re: [2005] deleting

    I have wondered about this actually. I have created a few programs that when opened in Notepad, show some of the program's code or resources. I would be interested to find out if this is possible too...
    I use Microsoft Visual Basic 2008 Express Edition.

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    Re: [2005] deleting

    You're seeing your resources because they're embedded into your application. They're not encrypted, they're just embedded. Also, you may be seeing some MSIL because that is what your program is compiled into.

    If you don't want others getting your resources, you're going to ahve to encrypt them and then import them.
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    Re: [2005] deleting

    and how do i encrypt them and lets my program decrypt them?
    and is there no solution for that my database password is visible? :|

  11. #11
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    Re: [2005] deleting

    Quote Originally Posted by Wytse Talsma
    and how do i encrypt them and lets my program decrypt them?
    and is there no solution for that my database password is visible? :|
    This is one of the reasons I recommend doing research before developing a project in a language instead of trying to find ways around how it's supposed to work.

    If you want to encrypt them, you can do it multiple ways. You can use an external program (but you may have to package that with your app to do the decryption) or you can use the Cryptography namespace to encrypt and decrypt resources. Just search the forum, there are tons of coding examples.

    As for the database password being visible, I believe someone posted a solution in the CodeBank, otherwise you can encrypt that as well or if you're using VS 2005, you may be able to serialize a SecureString class containing the password.
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    Re: [2005] deleting

    Another solution (that I would recommend over what you're trying to do) and remove the database functionality from your application. Most servers (I'd say 99.9%+) do not allow you to connect to their MySQL database unless you're on the localhost (meaning on the machine itself) and they do that for a reason; security. You may want to create several PHP scripts to add and remove data from the database that your application can call instead. Then there is no visible MySQL password.
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    Re: [2005] deleting

    Heres a link on how to encrypt/decrypt in .NET - http://msdn2.microsoft.com/en-us/lib...raphy.md5.aspx
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  14. #14

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    Re: [2005] deleting

    Tnx for the link robdog888

    how do I use the SecureString class? I do can it make readonly... but that isn't working

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    Re: [2005] deleting

    Are you following the code example in the link I posted?
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    Re: [2005] deleting

    Quote Originally Posted by Wytse Talsma
    Tnx for the link robdog888

    how do I use the SecureString class? I do can it make readonly... but that isn't working
    A SecureString class does not work with Strings directly as everything you do ANYTHING as a string, .Net creates a copy of it and there is no guarentee when it will be destroyed, thus making Strings insecure and inefficient.

    SecureString can read in a Character Array to store your string securly. Getting data out of it is a different story.

    See this thread
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    Re: [2005] deleting

    thanks a lot I can sure use this info
    But at the moment I'm a little tired (24 hour busy with programming is not good for you ) and I've solved it on my beginners-way
    I've made some strings, spread in the whole program (It's a long complicated one)
    And each string holds an value of my password
    suppose my password is: password
    string1 = p
    string532 = w
    string23 = o
    etc.
    and on the line I need the complete string-splitted word I call them back with
    string1 & string532 &
    etc.
    now I'll rest a while

  18. #18
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    Re: [2005] deleting

    That's easy to crack. Gimme 5 minutes with an MSIL decompiler and I'll be able to see your entire method of putting the string together

    Security through obscurity is not security.
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    Super Moderator RobDog888's Avatar
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    Re: [2005] deleting

    Than that means Dotfuscator is 100% useless.
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  20. #20
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    Re: [2005] deleting

    Quote Originally Posted by RobDog888
    Than that means Dotfuscator is 100% useless.
    Well, all it does it rename your methods and variables. It has options to encrypt (but you pay $1000 for that version) which is nice but it only encrypts strings (as far as I know). An Obfusticator should not be regarded as security for your application. It only makes it less obvious what your code is doing. It can still be pieced together much easier than someone decompiling C++ code.
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