Hello experts

I am completely new here and I wonder if piwigo is suitable to fulfil my wish. Years ago I made a website for my students and this website has been visited 30,000 times. As a result of the privacy law I want to prevent malicious people from being able to access the website and so I want to put a lock on it. I am not concerned about parts of the site, but I would like my former pupils to be able to view the whole site. Therefore I would like them to receive a message at the opening that they should send me an email with their details so I can check if they really have been former pupils of my school. Is it then possible to grant access to the whole site?
Because I regularly backup I don't need an extra address in the cloud, but I only want to manage access.
Thank you in advance for your much appreciated help.

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Piwigo URL: http://

janmac