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\begin{tikzpicture}[
-latex,
entity/.style = {
draw = gray!30,
thick,
rounded rectangle,
fill = white,
minimum width = 2cm,
font = \fontsize{8}{8}\selectfont,
text = white,
},
relation/.style = {
draw = none,
font = \fontsize{6}{6}\selectfont,
},
path/.style = {
draw,
thick,
-latex,
},
]
\node[entity, fill=darkBlue] (Website) at (0,0) { Website };
\node[entity, fill=darkGreen, below=1.5cm of Website] (Browser) {Browser};
\node[entity, fill=darkOrange, left=1.5cm of Website] (Log) {Log};
\node[entity, fill=darkRed, below=1.5cm of Log] (Monitor) {Monitor};
% Get certificate and proofs of logging
\path[path] (Website) --
node[relation, right] {
\begin{tabular}{c}
Certificate\\
Proofs of logging\\
\end{tabular}
}
(Browser);
% Verification
\path[path, rounded corners]
(Browser.180) -|
($ (Browser) + (-1.25,-.75) $)
node[relation, below]{
Verify
} -|
(Browser.210);
% Monitoring
\path[path] (Monitor) edge[bend right]
node[relation,right]{}
(Log);
\path[path] (Log) edge[bend right]
node[relation,left]{}
(Monitor);
\path[path, rounded corners]
(Monitor.180) -|
($ (Monitor) + (-1.25,-.75) $)
node[relation, below]{
Mis-issuance?
} -|
(Monitor.210);
% Get proofs
\path[path, dashed] (Log) --
node[relation,above]{Proofs of logging}
(Website);
% Add certificates to log
\path[path, dashed] ($ (Log) + (-2,0) $) --
node[relation, above] { Certificates }
(Log);
\end{tikzpicture}
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