>The book Building Secure ASP.NET Applications (http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnnetsec/html/SecNetHT10.asp) contains a section titled How To: Create An Encryption Library that may be of help to you.
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Mike,

Thanks, Mike. That article turned up in my last MSDN search. I just didn't get to it yet.< s >