some minor talk flow additions

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Trolli Schmittlauch 2018-07-16 20:06:48 +02:00
parent 0c8bab366c
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3 changed files with 76 additions and 5 deletions

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\begin{itemize}
\item \textbf{E}uropean \textbf{T}elecommunications \textbf{S}tandards \textbf{I}nstitute
\item network technologies used in middle layers:
\item this survey: focus on network technologies used in middle layers:
\begin{itemize}
\item GeoNetworking for geographical routing
\item BTP as transport protocol
@ -202,7 +202,6 @@ communication}
\begin{itemize}
\item problem: constant communication allows tracking of vehicles
\item \textit{linkability} of messages threat to \textit{location privacy}
\item this survey: focus on middle network layers
\item linkable identifiers in messages:
\begin{itemize}
\item vehicle position
@ -249,11 +248,11 @@ communication}
\item other nodes present for ambiguity
\item coordinated change
\item random change frequency
\item all identifiers changed simulataneously, buffers flushed
\item all identifiers changed simultaneously, buffers flushed
\end{itemize}
\item Car-2-Car CC: divide trips into 3 segments
\item Mix Zones
\item Silent Periods
\item Mix Zones
\end{itemize}
\end{frame}
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\begin{frame}
\center\huge{Thank you for your attention}
\center\huge{Thank you for your attention!}
\includegraphics[height=0.5\textheight]{figures/nomnompingu.png}\tiny\footnote{CC-BY-SA 3.0 by Elektroll}

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talk_notes.md Normal file
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% notes ITS talk
- quite a long title, so let's 1st talk about ITS before we get to the Pseudonym Schemes
## ITS
- road traffic is still dangerous part of our everyday lives
- infrastructure assist safety
- recent years: decrease of traffic deaths
- probably also thanks to assistance systems
- currently working on their own
- collaboration, proactively broadcast, communicate
- multiple standardization groups working on it
- survey focuses on middle layers
- GN: geograhical ad-hoc routing, broadcast unicast multicast
- constant communication, linkability
- location privacy: deriving location patterns of a single user
- authorized senders: message signing
## pseudonym schemes
- proposed solution: pseudonyms
- must not be linkable
- we only want authorized vehicles to communicate
- a priori trusted: RootCA
- EA knows vehicle ID & public key
- AA trusts valid EA certificates
- pseudonym resolution: desirable for law enforcement agencies
## pseudonym change
- many strategies have been proposed
- C2C CC: statistical values:
- shall achieve that locations significant to a user can't be linked together nor to the user
- 0.8-1.5km, then each 0.8km or 2-6min
- vehicle-centric change strategies: depending on mobility, trajectory
- density-based
- cryptographic mix zones: symm. key from RSU
- safety of collision avoidance systems
### advanced schemes
- identity-based:
- advantage: no certificates needed as ID = key
- disadvantage: splitting mapping information hard, Trusted Authority involved in key derivation
- group signature:
- all members of group can sign for same public key
- problems: group leader, group change -> re-setup of all group keys
- symmetric MACs:
- less computation overhead
- but not really practically usable, as signature checking is done by 3rd parties
## attacker model
- single-point:
- communication with EA and AA encrypted, C2C 3 segments (reception range)
- no cooperative change needed
- global passive:
- cooperative change
- cryptographic mix zones sufficient
- active: pseudonym depeltion
- active insider:
- real silent periods needed, crypto mix zones don't work anymore
- servers in the internet can't link IPv6 address thanks to stateless autoconfiguration
- special attacks:
- pseudonym depletion attack
- sybil attack
- privileged: accountability, resolution
- needs independent judicial systems and separation of powers