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re-do pictures
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\end{frame}
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\begin{frame}[t]{pre-recursor passive DNS: store-everything-that-you-can approach (Cisco implementation)}
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\begin{frame}[t]{pre-recursor passive DNS: store-everything-that-you-can approach (potential privacy problem)}
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\begin{centering}
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\vbox{}\vfill
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\includegraphics[scale=0.25]{pre-recursor.png}
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\includegraphics[scale=0.3]{pre-recursor.png}
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\vfill
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\end{centering}
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\end{frame}
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\end{itemize}
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\begin{centering}
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\vbox{}\vfill
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\includegraphics[scale=0.24]{post-recursor.png}
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\includegraphics[scale=0.3]{post-recursor.png}
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\vfill
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\end{centering}
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\end{frame}
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\begin{frame}[t]{Why pDNS? Answer which Questions?}
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\begin{frame}[t]{Why pDNS? Answers which questions?}
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\begin{itemize}
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\item For example:
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\item Historic data: ,,What was the A record for a certain FQDN last year?''
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\item Inverse Lookups: ,,Which domains have A records that are in a given address range?''
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\item Egypt goes offline: ,,Which domains are offline because all their nameservers are in egyptian IP space?''
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\item Generic reseach on bulk DNS data: T. Frosch, T. Holz: ,,Predentifier: Detecting Botnet C\&C Domains From Passive DNS Data''
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\item The first time, we can get a sampled subset of \emph{the DNS} per se. I.e.: what is actually out there?
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\end{itemize}
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\begin{itemize}
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\item Nowadays Passive DNS servers are created\footnote{To our knowledge, there are more than 15 software implementations} and used worldwide
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\item DNS data is very \emph{localized}. It makes sense to have multiple, local DBs (different legal environments, access rights, restrictions to data,...)
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\item ... but that means we need a way to query multiple DBs.
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\item ... but that means we need a way to \emph{query multiple DBs}.
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\item In 2011, we started to work on a \emph{common output format} for Passive DNS systems at the FIRST annual conference
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\item After discussions with many authors of passive DNS, version 02 of the internet-draft is published
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\end{itemize}
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