File:MAC attacker.svg

\documentclass{standalone}

\usepackage{pgffor}         %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\usepackage{ifthen}         % This image is part of a large %
\usepackage{pgfplots}       % collection of diagrams. Some  %
\usepackage{libertineRoman} % or all of the used packages   %
\usepackage{biolinum}       % may not be necessary to com-  %
\usepackage{fontawesome5}   % pile this specific file but   %
\usepackage{epsdice}        % vital for others. Sorry for   %
\usepackage{mathtools}      % any inconvenience. -- Sn KGS  %
\usepackage{amsfonts}       %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\newcommand{\highlight}[1]{\textbf{\textsf{#1}}}
\newcommand{\todo}[1]{\textbf{\color{red}TODO: #1}}
\newcommand{\drawrand}{\ensuremath{\xleftarrow{\mathcal{R}}}}

\usetikzlibrary{decorations.pathreplacing}
\pgfplotsset{compat=1.17}

\begin{document}

\begin{tikzpicture}
[thick, algo/.style={draw, rectangle, minimum height=1cm, minimum width=1cm}]

\draw (0,1) rectangle (3,10);
\draw (5,1) rectangle (6,10);

\node (C) at (0.5,9.5) {$C$};
\node (A) at (5.5,9.5) {$A$};
\node (G)  [algo] at (2,9) {\pgfmathparse{random(1,6)} \epsdice{\pgfmathresult}};
\node at (2,4.75) {$\vdots$};
\node at (3.75,4.75) {$\vdots$};
\node (V)  [algo] at (2,2) {$V$};
\node (res) at (2,0) {$0/1$};

\foreach \y/\i in {7.5/0,6/1,3.5/{n-1}} {
    \node (T\i) [algo] at (2,\y) {$T$};
    \draw [->] (5,\y+0.25) -- node [above] {$m_{\i}$} (2.5,\y+0.25);
    \draw [->] (2.5,\y-0.25) -- node [below] {$t_{\i}$} (5,\y-0.25);
    \draw [->, rounded corners] (0.5,\y+0.5) |- (T\i);
}

\draw [->, rounded corners] (G) -| node [right,yshift=-0.5cm] {$k$} (0.5,8) |- (V);
\draw [->] (5,2.25)   -- node [above] {$m^*$} (2.5,2.25);
\draw [->] (5,1.75)   -- node [below] {$t^*$} (2.5,1.75);

\draw [->] (V) -- (res);

\end{tikzpicture}

\end{document}