During my time in a call center people would often call for invoices or messages they received. Most of my work there was reading the thing together with them. Nothing more was necessary, I just read alound their itemized invoice that they had received and it would solve their problem.
Click through pop-ups are even worse in this regard. I myself usually just automatically click No before I understand what just happened.
However, you can save encrypted ssh, gpg keys and save that encryption key in the OS keyring.