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Re: Where should port rights go?

From: Farid Hajji
Subject: Re: Where should port rights go?
Date: Thu, 16 Nov 2000 04:05:07 +0100

> Many ways to implement port rights come to mind. Here are some ideas:

9. port-rights entirely managed by concerned parties:

   * every communicating party is uniquely identified by its
     sender-id/receiver-id. This information is provided by
     the kernel/libmom and is considered trusted.
   * port rights are managed by each party like this:
      1. sender that whishes to give out a port right generates a
         random id, saves that id in an internal table and sends
         this it out to the recipient.
      2. recipient uses this id in subsequent communications with
         sender or with third parties, also caching the id in its
         own table.
      3. the third party can check the port right by asking the
         originator to verify the random-id.
   * random-ids should be timestamped and stamped with their intended
     use by their originators before being sent out. Such stamps could
     be used by other parties for verification purposes.
   * port rights can be inherited and moved along by adding more and
     more stamps to them.
   + distributed scheme that does not require any central authentication
   + fast generation and verification of rights
   + traceability through stamps.
   - slight chance of forgeability by clients that poll every random-id
     from a server (guessing id's).


Farid Hajji -- Unix Systems and Network Admin | Phone: +49-2131-67-555
Broicherdorfstr. 83, D-41564 Kaarst, Germany  | address@hidden
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