[#376] [DC] Implementation Flow. Extend security

docs/implementation-flow/ch07-s02-security.tex

@@ -15,7 +15,8 @@ \subsection{Securing Information}
 competitive advantage.
 
 To achieve information security, applications must implement robust cybersecurity measures, including encryption, 
-access controls, and regular security audits.
+access controls, and regular security audits. Ensuring the app security is a continuous endeavor that requires a 
+proactive approach.
 
 
 \subsubsection{Storing API keys}
@@ -38,6 +39,16 @@ \subsubsection{Storing API keys}
 String? apiKey = String.fromEnvironment('KEY', defaultValue: null);
 \end{lstlisting}
 
+\noindent For handling dynamic values, consider employing the \q{flutter\_secure\_storage}-package to securely store 
+sensitive data through encrypted shared preferences (\emph{Keychain for iOS and macOS, AES encryption for Android and 
+Windows, libsecret for Linux, and WebCrypto for Web}):
+
+\begin{lstlisting}
+final storage = new FlutterSecureStorage();
+await storage.write(key: key, value: value);
+String value = await storage.read(key: key);
+\end{lstlisting}
+
 
 \subsubsection{Encrypting Storage}
 \markboth{Productionizing}{Encrypting Storage}