OpenID for data portability in virtual world

What is OpenID

For OpenID related knowledge: http://en.wikipedia.org/wiki/OpenID

Foreign user login

In virtual world, To enable a foreign user authentication, What I can imagine is that there are 3 ways can be used.

• Import account from one GridService to another
• Use a central OpenID provider
• UserServer(OpenSim) acts as both RP and OP

Detailed explanations are following:

Import (copy an account information from one to another)

File:Openid auth 1.PNG

This is the most simple way, just copy an account from its original Gridservice to another, this can be done through webpages, and current OpenSim's Userserver already has a similar XMLRPC method (GetUserProfile) to do such thind, even though some security holes need to be filled.

Use a central OpenID provider

UserServer acts as both RP(Relying Party) and OP(OpenID Provider)