Take advantage of API key authentication to control the access of applications and services to your Web APIs in ASP.NET Core.

We wouldn’t consider Windows authentication as a feasible strategy as you cannot expose your service over the Internet if you leverage Windows authentication. Forms authentication uses the ASP.Net ...

They also should switch to using OAuth 2.0 for Exchange Online authentications in their applications, which is a "more secure and reliable" means of accessing data than Basic Authentication, according ...