diff --git a/src/tse/lr4/AccountManager.java b/src/tse/lr4/AccountManager.java
new file mode 100644
index 0000000..be0e507
--- /dev/null
+++ b/src/tse/lr4/AccountManager.java
@@ -0,0 +1,87 @@
+package tse.lr4;
+
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.util.ArrayList;
+
+/**
+ * Менеджер аккаунтов.
+ * @author aNNiMON
+ */
+public class AccountManager {
+    
+    public static final byte STATE_ACCOUNT_NOT_EXISTS = 0;
+    public static final byte STATE_PASSWORD_INCORRECT = 1;
+    public static final byte STATE_AUTH_SUCCESSFULL = 2;
+    
+    private static final String FILENAME = "accman";
+
+    private static AccountManager instance;
+
+    public static AccountManager getInstance() {
+        if (instance == null) {
+            instance = new AccountManager();
+        }
+        return instance;
+    }
+
+    private ArrayList<Account> accounts;
+    
+    public AccountManager() {
+        accounts = (ArrayList<Account>) deserialize(FILENAME);
+        if (accounts == null) accounts = new ArrayList<>();
+    }
+    
+    public boolean isAccountExists(String login) {
+        for (Account account : accounts) {
+            if (login.equals(account.getLogin())) return true;
+        }
+        return false;
+    }
+    
+    public byte checkAuth(String login, String md5hash) {
+        for (Account account : accounts) {
+            if (login.equals(account.getLogin())) {
+                if (md5hash.equals(account.getMd5hash())) {
+                    return STATE_AUTH_SUCCESSFULL;
+                } else return STATE_PASSWORD_INCORRECT;
+            }
+        }
+        return STATE_ACCOUNT_NOT_EXISTS;
+    }
+    
+    public void createNewAccount(String login, String md5hash) {
+        accounts.add(new Account(login, md5hash));
+        serialize(FILENAME, accounts);
+    }
+    
+    private void serialize(String filename, Object object) {
+        try {
+            FileOutputStream fos = new FileOutputStream(filename);
+            ObjectOutputStream oos = new ObjectOutputStream(fos);
+            oos.writeObject(object);
+            oos.flush();
+            oos.close();
+            fos.close();
+        } catch (IOException ex) {
+            ex.printStackTrace();
+        }
+    }
+    
+    private Object deserialize(String filename) {
+        Object object = null;
+        try {
+            FileInputStream fis = new FileInputStream(filename);
+            ObjectInputStream ois = new ObjectInputStream(fis);
+            object = ois.readObject();
+            ois.close();
+            fis.close();
+        } catch (IOException | ClassNotFoundException ex) {
+            ex.printStackTrace();
+        }
+        return object;
+    }
+}