在C＃中保护和加密.mdb文件

Question

I want to make my MS Access file (.mdb) unreadable/readable based on a key, using C#. I want to do this without using any third party tools. How can I do this?

Answer 1

This should be all you need:

http://msdn.microsoft.com/en-us/library/0dh224hh.aspx

This uses DESEncryption, and you should setup the IV (initialisation vector) to anything you want, as long as it's always the same, and the key (your password) can only be 8 bytes long.

To convert a string to bytes, you can use

System.Text.UTF8Encoding ue = new System.Text.UTF8Encoding();
byte[] bkey = ue.GetBytes(key);

I'll leave it up to you to make that 8 bytes long.

You may also want to store somewhere (eg another file) whether or not the mdb file is currently encrypted, because you don't want to end up encrypting it multiple times... in which case it could be quite hard to get it back.