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Posted on 2006-11-23
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Last Modified: 2010-04-23
There is a connection string stored in My.Settings but it only has read access to the SQL Server. It will be used just to validate the username and password entered by the operator to those stored in the DB. If validated, a new set of username and password is sent back to the user (but it is not encrypted, and I need to learn some encryption too.) Now a new connection string is created on the fly, using this new username and password. With this new connection string, the program has write access over the database.

I have that design in mind, since I don't want the username and password to be found by reverse engineering the executable. Is the above a good idea, or is it not?
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Question by:huji
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Expert Comment

by:Solar_Flare
ID: 18004962
so the username and password will be hardcoded into your application?

if so, why not just encrypt the connectionstring and put the encrypted version of the string into your application,then decrypt it at runtime before making the connection? this way decompiling your app will only reveal the encrypted string.
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Author Comment

by:huji
ID: 18006145
The first username and password (which has READ permission) is hardcoded. From the second connectionstring, only the database IP and catalog name are hardcoded, the rest (new username and password) comes from the SQL Server at runtime.
Your idea of encrypting these strings and decrypting them at runtime is appropriate. What encryption method do you suggest?
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Accepted Solution

by:
Solar_Flare earned 375 total points
ID: 18006152
you can use the system.security.cryptography classes.

this page http://www.codeproject.com/dotnet/SimpleEncryption.asp should help gut you started with some encryption :)
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LVL 14

Author Comment

by:huji
ID: 18006552
Well, I meant, should I use those basic methods, or should I use a different method which is not so well known? Does using known methods give a chance of reverse engineering them? (I know I'm doing an overkill, but I'm learning things.)
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Author Comment

by:huji
ID: 18020728
OK. Now, is the idea of transfering a second username and password over the network a good idea, or not?
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Assisted Solution

by:JackOfPH
JackOfPH earned 375 total points
ID: 18026156
It would be safe when you transffer the username and the password over the network if it is encrypted. But still there is a tendency that the transfer can be captured by other programs.
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