diff --git a/chapters/security/README.md b/chapters/security/README.md
new file mode 100644
index 0000000..1333ed7
--- /dev/null
+++ b/chapters/security/README.md
@@ -0,0 +1 @@
+TODO
diff --git a/index.rst b/index.rst
index 37eb357..5f05e64 100644
--- a/index.rst
+++ b/index.rst
@@ -86,6 +86,20 @@ USO lab book
    chapters/improve-cli/improve-shell.rst
    chapters/improve-cli/term-multiplexing.rst
 
+.. toctree::
+   :numbered:
+   :maxdepth: 3
+   :caption: Investigarea securității sistemului
+
+   chapters/security/data.rst
+   chapters/security/auth.rst
+   chapters/security/transfer.rst
+   chapters/security/process.rst
+
+
+
+
+
 
 Indices and tables
 ==================