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String Encryption With Visual Basic .NET

In this article Brian Patterson will cover some of the encryption classes provided in the .NET Framework. Once you have got a grasp on how to use these algorithms, he will wrap things up with a sample order application that will encrypt credit card information before saving it to either a SQL Server or Oracle database server.
http://www.devarticles.com/c/a/VB.Net/String-Encryption-With-Visual-Basic-.NET/