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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When an encrypted form is created, you'll be prompted to create a Private key and download it.
You'll need this key in order to view the encrypted responses of your JotForm. Without having this key, you'll not be able to view the encrypted responses. While trying to view the encrypted response from the submissions view, you'll be asked to upload your private key.
Once the Key is successfully saved, you'll be able to view the encrypted responses as normal text. Please refer to the following guide that can help you with how to use the encrypted forms.
Hope this information helps.