Simple insecure two-way data “obfuscation”?

I’m looking for very simple obfuscation (like encrypt and decrypt but not necessarily secure) functionality for some data. It’s not mission critical. I need something to keep honest people honest, but something a little stronger than ROT13 or Base64.

I’d prefer something that is already included in the .NET framework 2.0, so I don’t have to worry about any external dependencies.

I really don’t want to have to mess around with public/private keys, etc. I don’t know much about encryption, but I do know enough to know that anything I wrote would be less than worthless… In fact, I’d probably screw up the math and make it trivial to crack.

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