Absolutely - t1. That's when the user was authenticated by the IdP
to establish the current "session" at the IdP (which the 2nd
assertion is a part of).
Conor
> -----Original Message-----
> From: [mailto:]
> Sent: Thursday, February 07, 2008 7:48 PM
> To: Tom Scavo
> Cc: SAML Developers
> Subject: Re: [saml-dev] the value of AuthnInstant
>
> It's t1, isn't it? One assertion, issued at time t2, and another,
> issued at time t4, will both indicate that the user authenticated at
> time t1 -- assuming that authn session is still good, of course (e.g.,
> re-authn isn't being forced).
>
> Eve
>
> On Feb 7, 2008, at 4:04 PM, Tom Scavo wrote:
>
> > Suppose a user presents an AuthnRequest to an IdP at time t0. Since
> > the user has no security context initially, the IdP challenges the
> > user to authenticate, which the user does successfully (at time t1).
> > So the IdP issues an assertion (at time t2), which the user
transmits
> > to the SP via the browser.
> >
> > At some later time t3, the user presents another AuthnRequest to the
> > IdP. Since the user already has a security context, the IdP does
not
> > challenge the user to authenticate, but rather issues an assertion
(at
> > time t4), which again the user transmits to the SP.
> >
> > Question: What is the value of AuthnInstant in the second assertion?
> >
> > Thanks,
> > Tom
> >
> >
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> Eve Maler +1 425 947 4522
> Principal Engineer eve.maler @ sun.com
> Business Alliances group Sun Microsystems, Inc.
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