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Normally all the document related to an iOS application are stored in a document folder, which is attached to the relevant application. When we delete the application, that document folder also gets deleted. What I want to do is store all documents related to that application in a shared folder which will remain the same even though the application gets deleted from the device. Can I do this? If it is possible, I want to secure that folder so that it is not accessible through iTunes.
No. At least, you can’t do it on the device. Your app only has access to a piece of the file system, and that piece is deleted when the user deletes the app. It’s possible that you could store the data in iCloud, especially if you expect the user to have you app installed on other devices.
If you want to prevent the user from accessing the data, your best bet is probably to store the data on your own server. Second best would be to store the data in iCloud or similar and encrypt the data, but that’s probably not as reliable. (I expect iCloud is plenty reliable, but you don’t have as much control over that as you do over your own server.)