Authenticating on a server

Hi all! :)

I want users of my app (written in C#) to create accounts and use them to authenticate on a server. The connection should be secure. When authenticated, user is able to request information from server, change his account settings, etc.

My question is what technology to use on server side, PHP or ASP.NET? :ehh: And would web services be secure enough for this purpose?

I searched for the answer for a long time now, didn't find anything that would be suitable. :confused:

It's not the property of web services or PHP or ASP to make it secure, your code needs to have the logic which provides security.

You can use any technology along with use of SSL on server.