Encrypting Foreign Keys From Database?

Nov 7, 2010

I just came across some code that seems to encrypt database keys prior to sending them to the client (WebBrowser, Silverlight, etc).

To illustrate, suppose you have a list of students to extra-curricular activities, and a relationship defined between them. Every time the data is written out to the ASPX page, the studentID and activityID is encrypted. Every time a write, or modify is made, this value is sent back to the server, decrypted, and saved to the database.

What could be the reasons to expose data this way? Is this a normal practice?

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