Hi Alex, On 19.02.2013 15:31, Alexandru Petrescu wrote: > I agree privacy is important. > > An alternative method from R. Bless proposes to use a SHA output in the > prefix field of an address. This has an advantage with respect to > privacy - it's hardly feasible to reversely derive the VIN of the > vehicle from the IPv6 address, slide 6 of > http://www.lara.prd.fr/_media/ipv6-its/2012-03-26-seis-kit-ietf83-its.pdf > > That method alone has certain advantages, but also drawbacks.
> If we consider the problem to be as simple as "how to form IPv6 > addresses in a vehicle?" then one realizes that just forming a ULA > prefix for _within_ the vehicle may not be enough. Communication This is sufficient for the onboard communication network, which was the problem we addressed. ULAs are a good match, since these addresses should not leak. > outside the vehicle (e.g. between two vehicles) may involve links which > may not be just plain Ethernet, and hence impossible to just use RFC2464 > LL addresses on the outside of the vehicle. Our model was to have a security gateway for external connectivity and we assume that we may have various different access technologies such as LTE, WLAN, Bluetooth, and so on, i.e., multi-homing and changing addresses. I don't see any requirement to use algorithmically defined VIN-based addresses _between_ two vehicles: usually cars don't know which other cars are currently around them and especially they cannot know their VINs a priori. So usually you would need some kind of discovery protocol using well-known group addresses in order to figure out the unicast IPv6 addresses. > All in all, depending on the problem, the VIN-based addresses may be > necessary, provided that privacy concerns are addressed. I don't see the need yet if external communication is concerned. Regards, Roland -------------------------------------------------------------------- IETF IPv6 working group mailing list ipv6@ietf.org Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 --------------------------------------------------------------------
