121 lines
3.9 KiB
TeX
121 lines
3.9 KiB
TeX
\begin{figure}[h!]
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\centering
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%\footnotesize % Apply footnotesize to all text
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\setmsckeyword{}
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\drawframe{no} % uncomment to not draw a frame
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\begin{msc}[
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/msc/title top distance=0cm,
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/msc/first level height=.1cm,
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/msc/last level height=0.7cm, % Slightly reduced
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/msc/head height=0cm,
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/msc/instance width=0cm,
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/msc/head top distance=0.5cm,
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/msc/foot distance=-0.0cm,
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/msc/instance width=0cm,
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/msc/every label/.append style = { % extra style for all labels
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/tikz/fill = white, % paint a white rectangle
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/tikz/draw = none, % no border
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/tikz/inner sep = 1pt % a little padding
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},
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/msc/condition height=0.1cm, % Reduced condition height
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]{}
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%%%%%%%%%%%%%%%%%% CONFIG %%%%%%%%%%%%%%%%%%%%%%%%%
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\setlength{\instwidth}{0\mscunit} % to remove default box below agents
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\setlength{\instdist}{2.21cm} % default value between agents
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%%%%%%%%%%%%%%%%%% AGENTS %%%%%%%%%%%%%%%%%%%%%%%%%
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\declinst{A}{ % Alice
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\begin{tabular}[c]{c}
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Alice (Initiator) \\
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\end{tabular}
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}{}
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\declinst{Server}{ % Alice
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\begin{tabular}[c]{c}
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Server \\
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\end{tabular}
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}{}
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\declinst{B}{ % Bob
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\begin{tabular}[c]{c}
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Bob (Responder)
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\end{tabular}
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}{}
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\nextlevel[0.25]
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\action*{
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\footnotesize
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\begin{tabular}{@{}l@{}}
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\textsf{(pk\textsubscript{A}, sk\textsubscript{A}) = DH\_Gen()} \\
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\textsf{(spk\textsubscript{A}, ssk\textsubscript{A}) = SignGen()} \\
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\textsf{sig\_pk\textsubscript{A} = Sign(spk\textsubscript{A}, pk\textsubscript{A})}
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\end{tabular}
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}{A}
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\action*{
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\footnotesize
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\begin{tabular}{@{}l@{}}
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\textsf{(pk\textsubscript{B}, sk\textsubscript{B}) = DH\_Gen()} \\
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\textsf{(spk\textsubscript{B}, ssk\textsubscript{B}) = SignGen()} \\
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\textsf{sig\_pk\textsubscript{B} = Sign(spk\textsubscript{B}, pk\textsubscript{B})}
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\end{tabular}
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}{B}
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\nextlevel[3]
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\condition{{{\footnotesize out-of-band verification of \textsf{spk\textsubscript{A}, spk\textsubscript{B}}}}}{B,A,Server}
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%\nextlevel[2.5]
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%\mess{\footnotesize\textsf{spk\textsubscript{A}, sig\_pk\textsubscript{A}, pk\textsubscript{A}}}{A}{B}
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\nextlevel[2.5]
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\mess{\footnotesize\textsf{spk\textsubscript{B}, sig\_pk\textsubscript{B}, pk\textsubscript{B}}}{B}{Server}
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\nextlevel[1.25]
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\mess{\footnotesize Request pre-keys}{A}{Server}
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\nextlevel[1.25]
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\mess{\footnotesize\textsf{spk\textsubscript{B}, sig\_pk\textsubscript{B}, pk\textsubscript{B}}}{Server}{A}
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\nextlevel[0.75]
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\action*{
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\footnotesize
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\begin{tabular}{@{}l@{}}
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\textsf{if CheckSign(spk\textsubscript{B}, pk\textsubscript{B}, sig\_pk\textsubscript{B})} \\
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\textsf{key = DH(sk\textsubscript{A}, pk\textsubscript{B})}
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\end{tabular}
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}{A}
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\nextlevel[3.15]
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% \mess{\footnotesize\textsf{spk\textsubscript{A}, sig\_pk\textsubscript{A}, pk\textsubscript{A}}}{A}{B}
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% \mess{\footnotesize\raisebox{-0.5ex}\colorbox{white}{\textsf{spk\textsubscript{A}, sig\_pk\textsubscript{A}, pk\textsubscript{A}}}}{A}{B}
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\mess{%
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\smash{\raisebox{-0.05ex}{\makebox[0pt]{%
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\colorbox{white}{\footnotesize\textsf{spk\textsubscript{A}, sig\_pk\textsubscript{A}, pk\textsubscript{A}}}%
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}}}
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}{A}{B}
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\nextlevel[0.5]
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\action*{
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\footnotesize
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\begin{tabular}{@{}l@{}}
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\textsf{if CheckSign(spk\textsubscript{A}, pk\textsubscript{A}, sig\_pk\textsubscript{A})} \\
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\textsf{key = DH(sk\textsubscript{B}, pk\textsubscript{A})}
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\end{tabular}
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}{B}
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\nextlevel[1]
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\end{msc}
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\caption{An example workflow of asynchronous authenticated key exchange. Bob, the responder, uploads his pre-key material ({\footnotesize\textsf{spk\textsubscript{B}, sig\_pk\textsubscript{B}, pk\textsubscript{B}}}) to the server. Alice, the initiator, fetches Bob's key material from the central server at her leasure, and initiates the authenticated key exchange and \textsf{DH} key agreement}
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\end{figure}
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