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Re: [3gv6] Call for v6ops agenda items

On 2010-02-16 16:11, Laganier, Julien wrote:

- Privacy addresses [RFC4941]


Hmm...

When the link is point-to-point (such as in cellular systems), every host has to be assigned with a unique prefix. Doing so makes the use of randomized interface identifiers [RFC4941] ineffective from a privacy protection point of view because the host can still be uniquely identified by its prefix.
Of course. This is true for any network. 3GPP is not special in this respect. Quoting from RFC4941: 

                                              Although it might appear
   that changing an address regularly in such environments would be
   desirable to lessen privacy concerns, it should be noted that the
   network prefix portion of an address also serves as a constant
   identifier.  All nodes at, say, a home, would have the same network
   prefix, which identifies the topological location of those nodes.
   This has implications for privacy, though not at the same granularity
   as the concern that this document addresses.  Specifically, all nodes
   within a home could be grouped together for the purposes of
   collecting information.  If the network contains a very small number
   of nodes, say, just one, changing just the interface identifier will
   not enhance privacy at all, since the prefix serves as a constant
   identifier.
But others have already mentioned that we cannot assume that there is always only one host per 3GPP link. 

Simon
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