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%%
%% A DANTE-Edition example
%%
%% Example 36-00-107 on page 814.
%%
%% Copyright (C) 2011 Herbert Voss
%%
%% It may be distributed and/or modified under the conditions
%% of the LaTeX Project Public License, either version 1.3
%% of this license or (at your option) any later version.
%%
%% See http://www.latex-project.org/lppl.txt for details.
%%
%%
%% ====
% Show page(s) 1
%%
\documentclass[]{article}
\pagestyle{empty}
\setlength\textwidth{201.70511pt}
\setlength\parindent{0pt}
\usepackage{amsmath, amsthm, amssymb}
\usepackage{pst-node}
\newcommand {\card}[1] {\lvert#1\rvert}
\newcommand {\eqobs} {\equiv_{obs}}
\newcommand {\gameemph}[1] {{\color{blue} #1}}
\newcommand {\gen}[1] {\langle#1\rangle}
\newcommand {\mybox}[1] {\psshadowbox[linecolor=gray,shadowcolor=lightgray]{#1}}
\newcommand {\sel} {\leftarrow}
\begin{document}
\rnode{game1}{\mybox{\small
\begin{tabular}{llcl}
let & ($e$, $d$) & $\sel$ & \gameemph{:encGen ElGamal: $1^n$}\\
& ($m_1$, $m_2$, $a$) & $\sel$ & :A: ($1^n$, $e$)\\
& $c$ & $\sel$ & \gameemph{:encEnc ElGamal: ($1^n$, $e$, $m_1$)}\\
in & \multicolumn{3}{l}{:A': ($1^n$, $m_1$, $m_2$, $a$, $e$, $c$)}\\
\end{tabular}}}\\[1cm]
\hspace*{2cm}
\rnode{game2}{\mybox{\small
\begin{tabular}{llcl}
let & ($e$, $d$) & $\sel$ & \gameemph{let $x$ $\sel$ fun(uniform, $\card{\gen{g_n}}$)}\\
& & & \gameemph{in ($g_n^x$, $x$)}\\
& ($m_1$, $m_2$, $a$) & $\sel$ & :A: ($1^n$, $e$)\\
& $c$ & $\sel$ & \gameemph{let $y$ $\sel$ fun(uniform, $\card{\gen{g_n}}$)}\\
& & & \gameemph{in ($g_n^y$, $m_1 \times e^y$)}\\
in & \multicolumn{3}{l}{:A': ($1^n$, $m_1$, $m_2$, $a$, $e$, $c$)}\\
\end{tabular}}}
%Arrows
\ncline{->}{game1}{game2}\ncput*{$\eqobs$}
\end{document}
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