[humanresolv] Tentative problem statement

Hello,
Please find below a tentative problem statement, comments are welcome.
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                  IP host pairing problem statement

Today, cell phone numbers are not published in a phonebook for avoiding
telemarketers, prank callers, Spam and SPIT (SPam over Internet
Telephony). Users today exchange their phone numbers upon user contact,
often through oral communication.

In IP telephony, users will need a user friendly "pairing" protocol
that identifies the two phones and let them exchange their SIP URIs and
Mobile IPv6 home addresses, and possibly other information. The phones
will establish an IPsec security association upon this first contact.
IPsec will be required not only for protecting their SIP URIs from
eavesdroppers, but also for protecting data.

"IP host pairing" is defined as a pairing protocol that can operate
over IP; upon user contact and also over the Internet i.e. long distances.
It will address three problems of pairing:

1. Pairing when there is user contact: In this case, users can exchange
   their names or pseudonyms helping identify the hosts to each other the
   first time they meet.

2. Re-pairing, or updating pairing state through the Internet: The users
   may change their SIP URIs and/or Mobile IPv6 home addresses or other
   information. The users will need to update these informations without
   waiting until their next meeting. Or, they may need additional
   information which was not previously exchanged when there was user
   contact.

3. Pairing without user contact (where possible): Users may know each
   other but user contact may not be possible. Or, two previously paired
   hosts may lose pairing state. Users cannot probably wait until their
   next meeting to recover from loss of state.

Engineering problems:

   - Identifying the two hosts to each other in (1) and (3).
   - Preventing unauthorized and annoying pairing attempts from unknown
     users.
   - The design of the pairing protocol used to exchange and update
     the SIP URIs, home addresses and possibly other information.
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