Force users to sign in to sign a document
We are using SharePoint with Nintex to automate document signing. The problem is that the URL it sends is completely anonymous. I'm wanting to find out how we can lock it down and force the assigned email address to login with their verified email address in order to view and sign the documents (only the documents for them). This will stop confidential documents being accessed by people that shouldn't see them.
The documents are internal only, e.g. for everyone to sign off on a new process or expenditure etc.
Anyone know if this is a possible setting or are we stuck with security by obscurity?

