JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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I understand that you have enabled the Form encryption option for your JotForm and has downloaded the private key. Please be noted that the submissions received for the encrypted forms will not be displayed normally unless the downloaded private key is supplied when prompted. So, it is required to keep the private key in a safe place. Also, it is not possible to regenerate the same key again if the key is lost. If the key is lost, it is not possible to decrypt the submissions received while the form is encrypted.
Please refer to the guide below that can help you with more information on encrypted forms.
Hope this information helps! Let us know if you are referring something different. We will be happy to help.