diff --git a/.DS_Store b/.DS_Store
deleted file mode 100644
index 3771e14..0000000
Binary files a/.DS_Store and /dev/null differ
diff --git a/src/.DS_Store b/src/.DS_Store
deleted file mode 100644
index 6d1564c..0000000
Binary files a/src/.DS_Store and /dev/null differ
diff --git a/src/main/.DS_Store b/src/main/.DS_Store
deleted file mode 100644
index e02cf69..0000000
Binary files a/src/main/.DS_Store and /dev/null differ
diff --git a/src/main/java/de/hs_mannheim/domain/System.java b/src/main/java/de/hs_mannheim/domain/System.java
index 83d6686..1bb68a8 100644
--- a/src/main/java/de/hs_mannheim/domain/System.java
+++ b/src/main/java/de/hs_mannheim/domain/System.java
@@ -225,6 +225,9 @@ public class System {
         if (!new_password.equals(new_password_authentication))
             return false;
 
+        if(old_password.equals(new_password))
+            return false;
+
         for (int i = 0; i < this.all_user.size(); i++)
             if (this.all_user.get(i).getUsername().equals(current_user.getUsername()))
                 this.all_user.remove(i);
diff --git a/src/main/resources/.DS_Store b/src/main/resources/.DS_Store
deleted file mode 100644
index 3a2b8cc..0000000
Binary files a/src/main/resources/.DS_Store and /dev/null differ