For one of our cloud pages, we would need to add an authentication layer. Can the security feature available for microsites or somethign similar be applied to cloud pages?
You can enforce security on your landing page by requiring users to log in to see it. Currently, the system can validate that the users have a valid Salesforce Marketing Cloud account and password. http://help.marketingcloud.com/en-GB/documentation/exacttarget/content/microsites/landing_pages/