I've searched and haven't found an easy (good?) solution for problem.
I have an app that will send an email to a user who's account is about to expire. In the email, I want to have a link that, when clicked, will send the user to a page that will update the database with a new expiration date.
I want to encrypt the query string but haven't found the best way to store the decryption key on the web server. I would probably have to use a symmetrical solution, i.e. encrypting and decrypting with the same key. I saw where I could use "RijndaelManaged" like what was posted on asp.net here.
What would be a good (the best?) way to store the encryption key in both the encoding and decoding app?
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