how different is OpenID from SXIP?

Dick Hardt dick at
Sat Mar 18 06:02:47 UTC 2006

Unfortunately, very inaccurate.

A Homesite can be authoritative for any URL, just like in OpenID.  
Unlike OpenID, multiple Homesites may be authoritative for the same  
URL (since in OpenID you type in the URL, you can't select which  

In SXIP, I can use one Homesite one day, another the next day, but  
present the RP the same persona URL.

SXIP also allows you to store all your data on your own computer.  
Since the data is pushed, the repository does not need to be  
locatable by the RP. In OpenID, the IDP needs to be callable by the RP.

I think you totally missed my other points that the user will NOT  
always want to identify themselves. They may want to only provide  
some data. Impossible in OpenID.

On 17-Mar-06, at 1:17 PM, Joaquin Miller wrote:

> Clear and useful analysis, Dag.  Thanks.
> Cordially, Joaquin
>> I personally like how I can choose to use my own url for OpenID.   
>> This means that if I own a URL I can use it to identify me even as  
>> the services I use change.  Although I can use,  
>> which is not bad at all to type in in the first place, I can also  
>> use my personal domain, which points to the same OpenID  
>> server.  Many places I go on the internet and post things I am  
>> happy to say, "This is really, me, the one and only Dag Rorek  
>> Arneson". And if for some reason I want to change my IDP, or add a  
>> fallback IDP, all I have to do is change the magic at my URL.
>> If I want a new persona, I register a new account on myopenid  
>> site, say, and presto.  Save that the new account  
>> name is the reverse of my name, there's nothing that links the two  
>> personas.
>> With the SXIP way of doing things, I depend on my homesite for  
>> everything, and I am suddenly an entirely different person if I  
>> choose to use a new homesite.  In exchange, I can wait until I get  
>> to my homesite to decide if I want to be dag or gad on this RP,  
>> instead of simply entering the address for the appropriate persona  
>> when I am prompted on the RP.  Since most everyone who does openid  
>> login uses "openid_url" as the name of the field, I should have  
>> auto completion for the field and so I don't have to type in the  
>> whole thing every time.
>>> Well, now the user has uniquely identified themselves with one of a
>>> small number of URLs that they can remember to type in. Are we  
>>> really
>>> that much further along then passwords?
>> Yes, this is precisely the goal.  We have a secure way of  
>> positively linking a browser session with a persona specified by a  
>> URL.  Provided that their account on their openid server is  
>> secure, nobody else can successfully assert that they own the URL,  
>> and thus they are the same person that logged in with that URL  
>> before.
>>> [1] also, if the email is pushed to the RP instead of being  
>>> pulled,  the Homesite can generate a unique email just for that  
>>> RP, so that  the RP does not have a triangulating identifier, and  
>>> also the user  can kill the unique email if it is abused
>> It's not necessary to push to gain this benefit.  In fact, claims  
>> like this were the source of my confusion regarding the definition  
>> of push. It is sufficient for the user to be able to change the  
>> data that is being sent in response to the request by the RP.

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