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.NET 3.5 Encrypt/Decrypt String

Posted on 2009-05-18
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Last Modified: 2013-11-08
I'm looking for functions usable in VB.NET (3.5 framework) that could be used to encrypt and decrypt stings for storage in a database. The database field is a varchar(100) and the source string will never exceed 20 characters.

We would store the key itself in a protected, central location.
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Question by:dthansen
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GuitarRich earned 2000 total points
ID: 24410909
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by:Tapan Pattanaik
ID: 24411147
hi dthansen,
             
                   Check these links.

Simple encrypting and decrypting data in C#:

http://www.codeproject.com/KB/security/DotNetCrypto.aspx

Programmatically Encrypt and Decrypt Configuration Sections in web.config using ASP.NET 2.0 & ASP.NET 3.5:


http://www.dotnetcurry.com/ShowArticle.aspx?ID=185

How To: Encrypt and Decrypt Data Using a Symmetric (Rijndael) Key (C#/VB.NET):

http://www.obviex.com/samples/Encryption.aspx


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by:oobayly
ID: 24411216
Personally, I'd use a VARBINARY field in the database as this will prevent any encoding headaches when converting the byte array to a string. Also, as you've no need to display the encrypted data, why bother with the overhead in converting an byte array to an unreadable string?

As tapanpattanaik suggested, Rijndael (AES) is the standard to use. It uses streams to to the encryption so at the most basic level, everything's done with byte arrays. You would of course be able to use a StreamWriter to write strings to the CryptoStream when encrypting, and a StreamReader to read from CryptoStream when decrypting.
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