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pqc.tex (3595B)

      1 \documentclass[aspectratio=169,t]{beamer}
      2 \input taler-macros
      3 \usepackage{msc,eurosym}
      4 
      5 
      6 \newcommand{\TITLE}{Post-Quantum Cryptography in GNU Taler}
      7 \newcommand{\SUB}{}
      8 \newcommand{\AUTHOR}{Christian Grothoff \& Tanja Lange}
      9 \newcommand{\SPEAKER}{Leon Schumacher \& Florian Dold}
     10 \newcommand{\INST}{BFH \& TU/e \& Taler Systems SA}
     11 \newcommand{\DATE}{\\ \ \vspace{0.5cm} \\ October 28\textsuperscript{th} 2026}
     12 
     13 % Do not edit this part
     14 \title{\TITLE}
     15 \subtitle{\SUB}
     16 \date{\DATE}
     17 \author[\SPEAKER]{\AUTHOR}
     18 \institute{\INST}
     19 
     20 \begin{document}
     21 
     22 \begin{frame}[plain]
     23 \maketitle
     24 \end{frame}
     25 
     26 
     27 \begin{frame}{Pre NGI TALER}
     28 
     29 \textbf{GNU Taler protocol provides asymetric privacy.}
     30     \begin{center}
     31       \includegraphics[width=0.8\textwidth]{operations.png}
     32     \end{center}
     33 \textbf{Problem 1: Many constructions used in the protocol are not PQ-safe.}
     34 \textbf{Problem 2: For the ``refresh'' step, no suitable construction is known.}
     35 \end{frame}
     36 
     37 
     38 \begin{frame}{NGI TALER objectives}
     39   
     40   \begin{enumerate}
     41   \item Complete inventory of constructions and PQ impact (DONE)
     42   \item Alternative protocol formulation for ``refresh'' step
     43     where suitable constructions exist (DONE) {\bf (*)}
     44   \item Recommendation of good primitives for each procol step (WiP)
     45   \end{enumerate}
     46       {\bf (*)}: For the new $k$-unique signature design suitable constructions exist,
     47       but currently available primitives introduce additional limitations implementations have
     48       to work around.
     49 \end{frame}
     50 
     51 
     52 \begin{frame}{Next steps}
     53   \begin{enumerate}
     54   \item Implement recommended new primitives (especially for blinding and $k$-unique signatures,
     55     for both of which no standard implementations exist)
     56   \item Integrate cipher-agility into the existing implementation
     57   \item Ensure $k$-unique signature limitations are reasonably mitigated
     58   \item Test, benchmark, optimize, ship
     59   \end{enumerate}
     60       {\bf Open issue: How to achieve {\em additive}\footnote{Additive hear means
     61         that we get the security of the stronger of the blind signature primitives used; in
     62         all other cases we can just enable multiple primitives and get the maximum security
     63         of any of the primitives.} PQC-security for blind sigs.}
     64 \end{frame}
     65 
     66 
     67 \begin{frame}{Cost estimates}
     68   \begin{itemize}
     69   \item[24 PM] Implement recommended new primitives, including on server backends and clients (iOS, Android)
     70   \item[36 PM] Integrate new primitives into the existing implementation (cipher-agility)
     71   \item[6 PM] Address $k$-unique signature limitations at the application layer
     72   \item[6 PM] Test, benchmark, optimize, ship
     73   \end{itemize}
     74   The first two can in theory be done by two people in parallel.
     75   \begin{center}
     76     $\Rightarrow$ Needs at least 18--24 months
     77   \end{center}
     78   Budget: $\approx$ \EUR{750k}.
     79 \end{frame}
     80 
     81 
     82 
     83 % This should be last...
     84 \begin{frame}{Acknowledgments}
     85 
     86   \begin{minipage}{0.45\textwidth} \ \\
     87     {\tiny Funded by the European Union (Project 101135475).}
     88 
     89     \begin{center}
     90       \includegraphics[width=0.5\textwidth]{images/bandera.jpg}
     91     \end{center}
     92   \end{minipage}
     93   \hfill
     94   \begin{minipage}{0.45\textwidth}
     95     {\tiny Funded by SERI (HEU-Projekt 101135475-TALER).}
     96 
     97     \begin{center}
     98       \includegraphics[width=0.65\textwidth]{images/sbfi.jpg}
     99     \end{center}
    100   \end{minipage}
    101 
    102   \vfill
    103 
    104   {\tiny
    105 
    106     Views and opinions expressed are however those of the author(s) only
    107     and do not necessarily reflect those of the European Union. Neither the
    108     European Union nor the granting authority can be held responsible for
    109     them.
    110 
    111   }
    112 \end{frame}
    113 
    114 \end{document}