"Michael B Allen" <[EMAIL PROTECTED]> writes:

> Your choices are based on necessity, not trust. If the web application
> needs delegated credentials (e.g. to authenticate as the user with
> another tier), then you need to send the TGT [1].

Unless you use a system such as WebAuth or Cosign that supports limited
delegation, in which case you can send only exactly the credentials that
the web application needs.

> [1] Kerberos provides other ways to limit how the TGT can be used and to
> proxy service tickets and such but I don't think browsers have support
> for such things yet.

They don't so far as I know.  Delegation in all the current browsers is an
all-or-nothing affair.

-- 
Russ Allbery ([EMAIL PROTECTED])             <http://www.eyrie.org/~eagle/>
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