init

diagrams/session-trans.tex

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+\begin{figure}[h!]
+  \centering
+  %\footnotesize % Apply footnotesize to all text
+  \setmsckeyword{}
+  \drawframe{no}    % uncomment to not draw a frame
+  \begin{msc}[
+    /msc/title top distance=0cm,
+    /msc/first level height=.1cm,
+    /msc/last level height=0.7cm,  % Slightly reduced
+    /msc/head height=0cm,
+    /msc/instance width=0cm,
+    /msc/head top distance=0.5cm,
+    /msc/foot distance=-0.0cm,
+    /msc/instance width=0cm,
+  /msc/every label/.append style = {    % extra style for all labels
+    /tikz/fill       = white,           % paint a white rectangle
+    /tikz/draw       = none,            % no border
+    /tikz/inner sep  = 1pt              % a little padding
+  },
+    /msc/condition height=0.1cm,  % Reduced condition height
+    ]{}
+    %%%%%%%%%%%%%%%%%% CONFIG %%%%%%%%%%%%%%%%%%%%%%%%%
+    \setlength{\instwidth}{0\mscunit} % to remove default box below agents 
+    \setlength{\instdist}{4cm}  % default value between agents
+
+    %%%%%%%%%%%%%%%%%% AGENTS %%%%%%%%%%%%%%%%%%%%%%%%%
+    \declinst{A}{              % Alice
+      \begin{tabular}[c]{c}
+        Alice \\
+      \end{tabular}
+    }{}
+    % \declinst{Server}{              % Alice
+      % \begin{tabular}[c]{c}
+        % Server \\
+      % \end{tabular}
+    % }{}
+    \declinst{B}{              % Bob
+      \begin{tabular}[c]{c}
+        Bob
+      \end{tabular}
+    }{}
+
+    \action*{
+      \footnotesize
+      \begin{tabular}{@{}l@{}} 
+        \textit{generates} \textsf{symkey\textsubscript{A0}} \\
+        \textsf{(pk\textsubscript{A}, sk\textsubscript{A}) = DH\_Gen()} 
+      \end{tabular}
+    }{A}
+
+    \nextlevel[2.3]
+
+    \condition{{\footnotesize Secure channel establishment via AKE}}{B,A}
+
+    \nextlevel[2.25]
+
+    \mess{
+      \footnotesize
+      \textsf{
+        pk\textsubscript{A}, symkey\textsubscript{A0}
+      }
+    }{A}{B}
+
+    \nextlevel[0.6]
+
+    \action*{
+      \footnotesize
+      \begin{tabular}{@{}l@{}}
+        \textit{generates} \textsf{m1} \\
+        \textsf{symkey\textsubscript{A1}} $\leftarrow$  \textsf{
+        Hash(symkey\textsubscript{A0})
+        }\\
+        \textsf{x1 = Encrypt(symkey\textsubscript{A1}, m1)} \\
+        \textsf{x1\_sig = Sign(pk\textsubscript{A}, x1)} 
+      \end{tabular}
+    }{A}
+
+    \nextlevel[4.4]
+
+    \mess{
+      \footnotesize
+      (server-side fan-out)
+      \textsf{
+        x1, x1\_sig
+      }
+    }{A}{B}
+
+    \nextlevel[0.6]
+
+    \action*{
+      \footnotesize
+      \begin{tabular}{@{}l@{}}
+\textsf{if CheckSign(sk\textsubscript{A}, x1\_sig))} \\
+        \textsf{symkey\textsubscript{A1}} $\leftarrow$ \textsf{Hash(symkey\textsubscript{A0})} \\
+        \textsf{m1 = Decrypt(symkey\textsubscript{A1}, x1)} 
+        % \textit{generates} \textsf{m1} \\
+        % \textsf{symkey\textsubscript{A1}} $\leftarrow$  \textsf{
+        % Hash(symkey\textsubscript{A0})
+        % }\\
+        % \textsf{x1 = Encrypt(symkey\textsubscript{A1}, m1)} \\
+        % \textsf{x1\_sig = Sign(pk\textsubscript{A}, x1)} 
+      \end{tabular}
+    }{B}
+
+    % \action*{
+      % \footnotesize
+      % \begin{tabular}{@{}l@{}}
+
+        % \textsf{if CheckSign(sk\textsubscript{A}, x1\_sig))} \\
+        % \textsf{symkey\textsubscript{A1}} $\leftarrow$ \textsf{Hash(symkey\textsubscript{A0})} \\
+        % \textsf{m1 = Decrypt(symkey\textsubscript{A1}, x1)} \\
+        % % \textsf{(pk\textsubscript{B}, sk\textsubscript{B}) = DH\_Gen()} \\
+        % % \textsf{(spk\textsubscript{B}, ssk\textsubscript{B}) = SignGen()} \\
+        % % \textsf{sig\_pk\textsubscript{B} = Sign(spk\textsubscript{B}, pk\textsubscript{B})}
+      % \end{tabular}
+    % }{B}
+
+
+
+   \end{msc}
+
+   \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.
+   }
+
+\end{figure}
+