VB 2010 [Tutorial] How To Encrypt/Decrypt File Contents Using Custom DLL

This program uses a custom DLL, containing the encryption and decryption methods, to decrypt the contents of a file, while allowing you to modify the contents, and then encrypting the contents when it is saved.

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[CyberCodeFreak]

Yes it can. You would need to modify the code to either point to the .csv file or create an Open File Dialog (for multiple files). Now if you try to load an encrypted .csv file in say Excel, you would either get a bunch of encrypted information or it will say the file is in the wrong format. So I would suggest that you decrypt the file before loading it from another application. Again, modifying the code for your exact purpose will be required.

[CyberCodeFreak]

That is correct. You get this error when you try to import an unknown namespace, such as System.ID. The correct statement is this:

Imports System.IO

[hooligan]

This is not a tutorial. It doesn't explain anything.

[CyberCodeFreak]

You need to check and see what you have entered for the declared value of "a" and make corrections as needed.

[YourNightmar]

To everyone getting an error with "Convert.FromBase64String": Don't use an already existing file. Create the file using the program

[CyberCodeFreak]

You can manually add what program opens the file through the registry. Or programmatically, such as:
My.Computer.Registry.ClassesRoot.CreateSubKey(".big").SetValue("", "BIG",
My.Computer.Registry.ClassesRoot.CreateSubKey("BIG\shell\open\command").SetValue("", Application.ExecutablePath & " ""%1"" ",

[jellyfishanimation]

Looks great but I cant get it to work. When I try and load the file I get this error Specified initialization vector (IV) does not match the block size for this algorithm. can you help ?

[d_ce]

I am also curious about the thing that imissblood asked. Is it possible to encrypt one file with for example extension .big (make it encrypted for any application) but with an exception of exactly pointed file .exe to read it?

I know i am asking too much probably, but can you make such DLL so we can be able to modify those two files? So we can point which file should be encrypted, and which application can read it!?

[onism]

Move over Gates and Buffett, there’s a new philanthropist in town

[AzakaSekai]

Can you post DLL Link?
I have a little trouble and annoy to copy these line

[Dragosx]

Can this be used to encrypt certain files ? For example for a game that i wanna protect the files so no one can use them ? Let's say i have a .csv file and i wanna encrypt it. The .csv file is readed by an .exe. I wonder if the .exe gonna load the .csv file if it's encrypted.

[zuliusakbar]

when i import system.ID
show error
Warning 1 Namespace or type specified in the Imports 'System.ID' doesn't contain any public member or cannot be found. Make sure the namespace or the type is defined and contains at least one public member. Make sure the imported element name doesn't use any

[jjpm]

When Im doing the Window Application's part when I write the line "Dim c As Byte() = Encrypt(b, a)

there is an error on the "a" the error message is "too many arguments to 'Public Shared Function Encrypt(value As String) By Byte()

Can someone please help me

[McsoftworksNet]

encrypt and decrypt are not declared please help

[Emykokumu]

can u upload code. i need the code to do my final project...please

[TheFacelessRage]

Great work! How long have you been using VB? I've been using it less than 2 years and my skills pale in comparison :c