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Have you checked this guide: https://www.jotform.com/help/344-What-are-Encrypted-Forms-and-how-to-use-them-as-expert. Most of the questions are answered there at the bottom.
Your key cannot be recreated, I believe. The wizard key generator will only show once and will give you the only key for your account, this is to avoid creating multiple keys. So we thoroughly advise that you store your key to a safe location.
I hope that helps.