I'm perfectly fine with using RP discovery as a mechanism for the RP to
specify what "policy" it requires. I believe that unsolicited assertions
are going to become more common, so we need to support it.
What I don't want OpenID to do is specify the actual syntax of the
pseudonymous identifier. I agree that the RP has to trust the OP (in
some sense) or make it's own determination that the OP is not honoring
the RP's wishes and then take some action.
For RP's behind firewalls, it would be nice to allow them some mechanism
other than RP discovery to assert their requirements, but that should
preclude the discover option.
Thanks,
George
Andrew Arnott wrote:
leaves out the scenario of unsolicited assertions.A new directed
identity value that the RP passes to the OP to indicate it wants a
psuedononymous identifier. Consider this:
An OP needs to perform RP discovery (already), and probably does so
before sending an unsolicited assertion in order to find out what the
assertion receiving URI would be for a given realm. DNOA does this
already. If that RP's XRDS document included a TypeURI element that
had a special psuedononymous-identifier-only-please value the OP could
pick up on this, and send the unsolicited assertion using the
appropriate type of claimed_id.
Likewise, when an RP sends an ordinary directed identity request to an
OP, the OP would again notice the RP's XRDS during RP discovery and
see what kind of identifier the RP wants and assert accordingly.
Yes, some OPs won't honor the RP's wishes, and some OPs don't do RP
discovery at all. Perhaps to help the RP detect whether the OP
respected its wishes would be to send a PAPE extension or some other
openid.* parameter to say "yes, this is a pseudo- identifier." RPs
have no way to analytically be certain that some identifier is
psuedononymous anyway, so ultimately the RP has to trust the OP
(whether implicitly or through a white list is up to the RP).
--
Andrew Arnott
"I [may] not agree with what you have to say, but I'll defend to the
death your right to say it." - Voltaire
On Wed, May 13, 2009 at 8:44 AM, George Fletcher <gffle...@aol.com
<mailto:gffle...@aol.com>> wrote:
I don't think OpenID should specify how pseudonymous identifiers
are generated. That should be up to the OP. But I like the idea of
using a fixed URI as the claimed_id value to specify the behavior
desired by the RP. If, however, we need to grow this to cover
anonymous based identifiers (i.e. the claims based models from
earlier in this thread) then it might make sense to look at a PAPE
extension that covers the type of identifier requested.
Thanks,
George
Nat Sakimura wrote:
Sorry for a slow response. This week is especially busy for me...
I borrowed the notion from Austrian Citizen ID system.
In there, the services are divided into "sectors."
A sector may span several agencies.
They call ID as PIN (Personal Identification Number).
There is a secret PIN (sPIN) which is not used anywhere but in
their SmartCard.
Then, sector sepcific PIN (ssPIN) is calculated in the manner of :
SHA1(sPIN + SectorID)
(Note, there is a bit more details but...)
I have thrown OP secret into it.
To avoid the analytic attack, I agree that it is better to use
individual secret, as some of you
points out.
Regards,
=nat
On Tue, May 12, 2009 at 5:55 PM, Dick Hardt
<dick.ha...@gmail.com <mailto:dick.ha...@gmail.com>> wrote:
On 12-May-09, at 1:36 AM, Nat Sakimura wrote:
Reason for using RP's Subject in XRD instead of simply
using realm is
to allow for something like group identifier.
would you elaborate on the group identifier concept?
This is just one idea. Downside of this approach
is that we need to set up a WG.
I am sure there are more ideas. It might be possible
to utilize AX
so that it will only be a profile that does not
require a WG.
So shall we start discussing which direction we want
to go forward?
sure!
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