127 lines
4.2 KiB
TeX
127 lines
4.2 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}{4cm} % 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 \\
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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
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\end{tabular}
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}{}
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\action*{
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\footnotesize
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\begin{tabular}{@{}l@{}}
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\textit{generates} \textsf{symkey\textsubscript{A0}} \\
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\textsf{(pk\textsubscript{A}, sk\textsubscript{A}) = DH\_Gen()}
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\end{tabular}
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}{A}
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\nextlevel[2.3]
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\condition{{\footnotesize Secure channel establishment via AKE}}{B,A}
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\nextlevel[2.25]
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\mess{
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\footnotesize
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\textsf{
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pk\textsubscript{A}, symkey\textsubscript{A0}
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}
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}{A}{B}
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\nextlevel[0.6]
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\action*{
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\footnotesize
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\begin{tabular}{@{}l@{}}
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\textit{generates} \textsf{m1} \\
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\textsf{symkey\textsubscript{A1}} $\leftarrow$ \textsf{
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Hash(symkey\textsubscript{A0})
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}\\
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\textsf{x1 = Encrypt(symkey\textsubscript{A1}, m1)} \\
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\textsf{x1\_sig = Sign(pk\textsubscript{A}, x1)}
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\end{tabular}
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}{A}
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\nextlevel[4.4]
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\mess{
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\footnotesize
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(server-side fan-out)
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\textsf{
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x1, x1\_sig
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}
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}{A}{B}
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\nextlevel[0.6]
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\action*{
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\footnotesize
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\begin{tabular}{@{}l@{}}
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\textsf{if CheckSign(sk\textsubscript{A}, x1\_sig))} \\
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\textsf{symkey\textsubscript{A1}} $\leftarrow$ \textsf{Hash(symkey\textsubscript{A0})} \\
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\textsf{m1 = Decrypt(symkey\textsubscript{A1}, x1)}
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% \textit{generates} \textsf{m1} \\
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% \textsf{symkey\textsubscript{A1}} $\leftarrow$ \textsf{
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% Hash(symkey\textsubscript{A0})
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% }\\
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% \textsf{x1 = Encrypt(symkey\textsubscript{A1}, m1)} \\
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% \textsf{x1\_sig = Sign(pk\textsubscript{A}, x1)}
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\end{tabular}
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}{B}
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% \action*{
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% \footnotesize
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% \begin{tabular}{@{}l@{}}
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% \textsf{if CheckSign(sk\textsubscript{A}, x1\_sig))} \\
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% \textsf{symkey\textsubscript{A1}} $\leftarrow$ \textsf{Hash(symkey\textsubscript{A0})} \\
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% \textsf{m1 = Decrypt(symkey\textsubscript{A1}, x1)} \\
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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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\end{msc}
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\caption{An example workflow of session transmission from Alice to Bob. Alice transmits her session information, including her session's symmetric key {\footnotesize\textsf{symkey\textsubscript{A0}}} and public signing key {\footnotesize\textsf{pk\textsubscript{A}}}. Alice generates a new message {\footnotesize\textsf{m1}}, hashes her session's symmetric key and uses it to encrypt {\footnotesize\textsf{m1}}, signs the ciphertext with {\footnotesize\textsf{sk\textsubscript{A}}}, then sends the ciphertext and signature to the server for server-side fan-out. The recipient, Bob, checks the signature, hashes his copy of the symmetric key, and decrypts.
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}
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\end{figure}
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