diff --git a/src/main/java/de/hitec/nhplus/Main.java b/src/main/java/de/hitec/nhplus/Main.java
index eb807a1..52813b3 100644
--- a/src/main/java/de/hitec/nhplus/Main.java
+++ b/src/main/java/de/hitec/nhplus/Main.java
@@ -1,6 +1,7 @@
 package de.hitec.nhplus;
 
 import de.hitec.nhplus.datastorage.ConnectionBuilder;
+import de.hitec.nhplus.login.LoginController;
 import javafx.application.Application;
 import javafx.application.Platform;
 import javafx.fxml.FXMLLoader;
@@ -34,8 +35,7 @@ public class Main extends Application {
     @Override
     public void start(Stage primaryStage) {
         this.primaryStage = primaryStage;
-        //executePassword();
-        executeMainApplication();
+        executePassword();
     }
 
     private void executePassword() {
@@ -44,10 +44,19 @@ public class Main extends Application {
             FXMLLoader loader = new FXMLLoader(Main.class.getResource("/de/hitec/nhplus/login/LoginView.fxml"));
             BorderPane pane = loader.load();
             Scene scene = new Scene(pane);
-            this.primaryStage.setTitle("NHPlus");
-            this.primaryStage.setScene(scene);
-            this.primaryStage.setResizable(true);
-            this.primaryStage.show();
+            Stage loginStage = new Stage();
+            loginStage.setTitle("NHPlus");
+            loginStage.setScene(scene);
+            loginStage.setResizable(false);
+
+            LoginController controller = loader.getController();
+            controller.initialize(loginStage);
+
+            loginStage.showAndWait();
+
+            if(controller.user == null){
+                executeMainApplication();
+            }
         } catch (IOException exception) {
             exception.printStackTrace();
         }
diff --git a/src/main/java/de/hitec/nhplus/login/LoginController.java b/src/main/java/de/hitec/nhplus/login/LoginController.java
index 1ab43b8..dca1cd7 100644
--- a/src/main/java/de/hitec/nhplus/login/LoginController.java
+++ b/src/main/java/de/hitec/nhplus/login/LoginController.java
@@ -1,8 +1,93 @@
 package de.hitec.nhplus.login;
 
+import de.hitec.nhplus.datastorage.DaoFactory;
+import de.hitec.nhplus.login.database.UserDao;
+import javafx.animation.PauseTransition;
+import javafx.animation.TranslateTransition;
+import javafx.fxml.FXML;
+import javafx.scene.control.Button;
+import javafx.scene.control.PasswordField;
+import javafx.scene.control.TextField;
+import javafx.stage.Stage;
+import javafx.util.Duration;
+
+import java.nio.charset.StandardCharsets;
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+import java.sql.SQLException;
+import java.util.Arrays;
+
 public class LoginController {
 
-    public void initialize() {
+    public User user;
+    @FXML
+    public TextField textFieldUsername;
+    @FXML
+    public PasswordField passwordField;
+    @FXML
+    public Button buttonSubmit;
+    private Stage stage;
+    private int loginTries = 0;
+
+
+    public void initialize(Stage stage) {
+        this.stage = stage;
+    }
+
+    private void handleWrongPasswordOrUsername() {
+        loginTries++;
+
+        // Shake
+        TranslateTransition ttUsername = new TranslateTransition(Duration.millis(50), textFieldUsername);
+        ttUsername.setByX(10);
+        ttUsername.setAutoReverse(true);
+        ttUsername.setCycleCount(6);
+
+        TranslateTransition ttPassword = new TranslateTransition(Duration.millis(50), passwordField);
+        ttPassword.setByX(10);
+        ttPassword.setAutoReverse(true);
+        ttPassword.setCycleCount(6);
+
+        ttUsername.play();
+        ttPassword.play();
+
+        // Timout
+        PauseTransition pause = new PauseTransition(Duration.seconds(3));
+        pause.setOnFinished(event -> {
+            if (loginTries == 3) {
+                stage.close();
+            }
+            buttonSubmit.setDisable(false);
+        });
+        pause.play();
+
+    }
+
+    @FXML
+    public void handleSubmit() {
+        buttonSubmit.setDisable(true);
+
+        UserDao dao = DaoFactory.getInstance().createUserDAO();
+        try {
+            int id = dao.readUserId(textFieldUsername.getText());
+            if (id == 0) {
+                handleWrongPasswordOrUsername();
+                return;
+            }
+            byte[] salt = dao.readPasswordSalt(id);
+            MessageDigest md = MessageDigest.getInstance("SHA-512");
+            md.update(salt);
+            byte[] hash = md.digest(passwordField.getText().getBytes(StandardCharsets.UTF_8));
+            byte[] requiredHash = dao.readPasswordHash(id);
+            if (!Arrays.equals(hash, requiredHash)) {
+                handleWrongPasswordOrUsername();
+                return;
+            }
+            user = dao.read(id);
+            stage.close();
+        } catch (SQLException | NoSuchAlgorithmException exception) {
+            exception.printStackTrace();
+        }
 
     }
 }
diff --git a/src/main/java/de/hitec/nhplus/login/database/UserDao.java b/src/main/java/de/hitec/nhplus/login/database/UserDao.java
index 6ea36ce..8807ca1 100644
--- a/src/main/java/de/hitec/nhplus/login/database/UserDao.java
+++ b/src/main/java/de/hitec/nhplus/login/database/UserDao.java
@@ -43,7 +43,12 @@ public class UserDao implements Dao<User> {
     @Override
     public User read(int id) throws SQLException {
         final String SQL = """
-                        SELECT user.username, user.passwordSalt, user.passwordHash, user__permissions.permissions, user__nurse.nurseId
+                        SELECT
+                        user.username,
+                        user.passwordSalt,
+                        user.passwordHash,
+                        user__permissions.permissions,
+                        user__nurse.nurseId
                         FROM user
                         LEFT JOIN user__permissions ON user.id = user__permissions.userId
                         LEFT JOIN user__nurse ON user.id = user__nurse.userId
@@ -174,7 +179,13 @@ public class UserDao implements Dao<User> {
     @Override
     public List<User> readAll() throws SQLException {
         final String SQL = """
-                        SELECT user.id, user.username, user.passwordSalt, user.passwordHash, user__permissions.permissions, user__nurse.nurseId
+                        SELECT
+                        user.id,
+                        user.username,
+                        user.passwordSalt,
+                        user.passwordHash,
+                        user__permissions.permissions,
+                        user__nurse.nurseId
                         FROM user
                         LEFT JOIN user__permissions ON user.id = user__permissions.userId
                         LEFT JOIN user__nurse ON user.id = user__nurse.userId
diff --git a/src/main/resources/de/hitec/nhplus/login/LoginView.fxml b/src/main/resources/de/hitec/nhplus/login/LoginView.fxml
index 2a3212d..234ff7b 100644
--- a/src/main/resources/de/hitec/nhplus/login/LoginView.fxml
+++ b/src/main/resources/de/hitec/nhplus/login/LoginView.fxml
@@ -1,9 +1,11 @@
 <?xml version="1.0" encoding="UTF-8"?>
 
-<?import javafx.geometry.*?>
-<?import javafx.scene.control.*?>
+<?import javafx.geometry.Insets?>
+<?import javafx.scene.control.Button?>
+<?import javafx.scene.control.Label?>
+<?import javafx.scene.control.PasswordField?>
+<?import javafx.scene.control.TextField?>
 <?import javafx.scene.layout.*?>
-
 <BorderPane
         xmlns="http://javafx.com/javafx/17.0.2-ea"
         xmlns:fx="http://javafx.com/fxml/1"
@@ -15,18 +17,31 @@
         <Insets bottom="8" left="8" right="8" top="8"/>
     </padding>
     <top>
-        <Label text="Anmeldung" BorderPane.alignment="CENTER" />
+        <Label text="Anmeldung" BorderPane.alignment="CENTER"/>
     </top>
     <center>
         <VBox spacing="8">
             <BorderPane.margin>
                 <Insets bottom="8.0" top="8.0"/>
             </BorderPane.margin>
-            <TextField promptText="nutzername" VBox.vgrow="ALWAYS"/>
-            <PasswordField promptText="password" VBox.vgrow="ALWAYS"/>
+            <TextField
+                    fx:id="textFieldUsername"
+                    promptText="nutzername"
+                    VBox.vgrow="ALWAYS"
+            />
+            <PasswordField
+                    fx:id="passwordField"
+                    promptText="password"
+                    VBox.vgrow="ALWAYS"
+            />
         </VBox>
     </center>
     <bottom>
-        <Button text="Bestätigen" BorderPane.alignment="CENTER" />
+        <Button
+                fx:id="buttonSubmit"
+                text="Bestätigen"
+                BorderPane.alignment="CENTER"
+                onAction="#handleSubmit"
+        />
     </bottom>
 </BorderPane>