On Sep 27, 2007, at 4:38 PM, [EMAIL PROTECTED] wrote:
From: "Pars Mutaf" <[EMAIL PROTECTED]>
The following is a new abstract solution, a third alternative, a
protocol
for "pairing" two cellular hosts:
Model of operation
1. The querier user types the target user's "human name" (as if
he were
consulting a phonebook), or a pseudoynm.
2. The pairing request is forwarded to the target phone.
3. The query, along with the querier user's name, are displayed
on the
target phone's screen.
4. The target user approves the request in real-time by pushing
on the YES
button of the phone.
5. The two phones exchange their Mobile IPv6 home addresses, SIP
URIs, and
establish an IPsec security association (using IKEv2).
How do you make this work? Step 2 seems to require that you have
already located the target phone, whereas the protocol's *purpose* is
to locate the target phone.
One possibility is that the directory service is operating on behalf
of the target, not the searcher. As such, the directory service is
trusted to know the display name to userID binding. When it receives
a query, the directory service uses the target's SIP contact
registration to send a consent request to the target user. If the
target user response positively, then the directory service returns
the directory's query result to the searcher.
Basically, another layer of indirection (directory) in front of a
watcher pattern.
There are probably other embodiments, but that's the obvious one.
--
Dean
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