References on security and hardening

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@@ -34,6 +34,11 @@
 
 * [Lintian Tag](https://lintian.debian.org/tags "Lintian Tag") list.
 
+## Security and Hardening
+
+* [Hardening - Debian Wiki](https://wiki.debian.org/Hardening)
+* [ServiceSandboxing - Debian Wiki](https://wiki.debian.org/ServiceSandboxing)
+
 ## Account handling
 
 * [AccountHandlingInMaintainerScripts - Debian Wiki](https://wiki.debian.org/AccountHandlingInMaintainerScripts "AccountHandlingInMaintainerScripts - Debian Wiki")