\begin{frame}
  \frametitle{Certificate Transparency---in short CT}
  \centering
  \begin{columns}
    \begin{column}{0.45\textwidth}
      \begin{itemize}
        \item Goal is to detect mis-issuance
        \item Publicly log all certificates
        \item Clients require proof of logging
      \end{itemize}
    \end{column}
    \begin{column}{0.55\textwidth}
      \centering
      \includegraphics[width=0.8\textwidth]{img/ct}
      \scriptsize{\url{https://www.certificate-transparency.org/what-is-ct}}
    \end{column}
  \end{columns}
  \pause
  \vfill
  \alert{How do you know if you see the same log?}
\end{frame}