diff --git a/app/src/main/java/it/niedermann/owncloud/notes/android/activity/NotesListViewActivity.java b/app/src/main/java/it/niedermann/owncloud/notes/android/activity/NotesListViewActivity.java
index a9d6806c..65658a02 100644
--- a/app/src/main/java/it/niedermann/owncloud/notes/android/activity/NotesListViewActivity.java
+++ b/app/src/main/java/it/niedermann/owncloud/notes/android/activity/NotesListViewActivity.java
@@ -1,6 +1,8 @@
 package it.niedermann.owncloud.notes.android.activity;
 
+import android.app.KeyguardManager;
 import android.app.SearchManager;
+import android.content.Context;
 import android.content.Intent;
 import android.content.res.Configuration;
 import android.database.sqlite.SQLiteConstraintException;
@@ -187,6 +189,18 @@ public class NotesListViewActivity extends AppCompatActivity implements ItemAdap
         setupNavigationList(categoryAdapterSelectedItem);
         setupNavigationMenu();
         setupNotesList();
+
+        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.LOLLIPOP) {
+            KeyguardManager keyguardManager = (KeyguardManager) getSystemService(Context.KEYGUARD_SERVICE);
+            if (keyguardManager != null) {
+                Intent i = keyguardManager.createConfirmDeviceCredentialIntent(null, null);
+                i.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
+                startActivityForResult(i, 999);
+            } else {
+                Log.e(TAG, "Keyguard manager is null");
+//            finishWithResult(-45);
+            }
+        }
     }
 
     @Override
diff --git a/app/src/main/java/it/niedermann/owncloud/notes/util/DeviceCredentialUtil.java b/app/src/main/java/it/niedermann/owncloud/notes/util/DeviceCredentialUtil.java
new file mode 100644
index 00000000..6d656fba
--- /dev/null
+++ b/app/src/main/java/it/niedermann/owncloud/notes/util/DeviceCredentialUtil.java
@@ -0,0 +1,32 @@
+package it.niedermann.owncloud.notes.util;
+
+import android.app.KeyguardManager;
+import android.content.Context;
+import android.os.Build;
+import android.util.Log;
+
+import androidx.annotation.RequiresApi;
+
+/**
+ * Utility class with methods for handling device credentials.
+ */
+@RequiresApi(Build.VERSION_CODES.M)
+class DeviceCredentialUtils {
+
+    private static final String TAG = DeviceCredentialUtils.class.getCanonicalName();
+
+    private DeviceCredentialUtils() {
+        // utility class -> private constructor
+    }
+
+    public static boolean areCredentialsAvailable(Context context) {
+        KeyguardManager keyguardManager = (KeyguardManager) context.getSystemService(Context.KEYGUARD_SERVICE);
+
+        if (keyguardManager != null) {
+            return keyguardManager.isKeyguardSecure();
+        } else {
+            Log.e(TAG, "Keyguard manager is null");
+            return false;
+        }
+    }
+}