diff --git a/lib/data/models/contact_model.dart b/lib/data/models/contact_model.dart
index 5384dfa..7155161 100644
--- a/lib/data/models/contact_model.dart
+++ b/lib/data/models/contact_model.dart
@@ -9,6 +9,7 @@ class Contact {
   final bool isOnline;
   final int unreadCount;
   final String? publicKey;
+  final bool isLastMsgDecrypted;
 
   Contact({
     required this.id,
@@ -21,6 +22,7 @@ class Contact {
     this.isOnline = false,
     this.unreadCount = 0,
     this.publicKey,
+    this.isLastMsgDecrypted = false,
   });
 
   Contact copyWith({
@@ -34,6 +36,7 @@ class Contact {
     bool? isOnline,
     int? unreadCount,
     String? publicKey,
+    bool? isLastMsgDecrypted,
   }) {
     return Contact(
       id: id ?? this.id,
@@ -46,6 +49,7 @@ class Contact {
       isOnline: isOnline ?? this.isOnline,
       unreadCount: unreadCount ?? this.unreadCount,
       publicKey: publicKey ?? this.publicKey,
+      isLastMsgDecrypted: isLastMsgDecrypted ?? this.isLastMsgDecrypted,
     );
   }
 
@@ -68,6 +72,7 @@ class Contact {
       isOnline: (json['is_online'] ?? json['isOnline']) == true,
       unreadCount: int.tryParse((json['unread_count'] ?? json['unreadCount'] ?? 0).toString()) ?? 0,
       publicKey: json['public_key'],
+      isLastMsgDecrypted: json['is_last_msg_decrypted'] ?? false,
     );
   }
 }
diff --git a/lib/data/repositories/contact_repository.dart b/lib/data/repositories/contact_repository.dart
index 9061658..a0acc86 100644
--- a/lib/data/repositories/contact_repository.dart
+++ b/lib/data/repositories/contact_repository.dart
@@ -10,6 +10,12 @@ class ContactRepository {
 
   Future<List<Contact>> fetchChatContacts() async {
     final token = await _apiService.getAccessToken();
+    
+    
+    DateTime now = DateTime.now();
+
+    Duration offset = now.timeZoneOffset;
+
     if (token == null) {
       throw Exception('No access token');
     }
@@ -24,7 +30,14 @@ class ContactRepository {
 
     if (response.statusCode == 200) {
       final List<dynamic> data = jsonDecode(utf8.decode(response.bodyBytes));
-      return data.map((json) => Contact.fromJson(json)).toList();
+      List<Contact> contacts = data.map((json) => Contact.fromJson(json)).toList();
+      for (var item in contacts) {
+        if (item.lastMessageTime != null) {
+          DateTime serverTime = item.lastMessageTime!;
+          item = item.copyWith(lastMessageTime: serverTime.add(offset));
+        }
+      }
+      return contacts;
     } else {
       throw Exception('Failed to load contacts');
     }
@@ -32,6 +45,10 @@ class ContactRepository {
 
   Future<List<Contact>> fetchAllUsers() async {
     final token = await _apiService.getAccessToken();
+
+    DateTime now = DateTime.now();
+    Duration offset = now.timeZoneOffset;
+    
     if (token == null) {
       throw Exception('No access token');
     }
@@ -46,7 +63,14 @@ class ContactRepository {
 
     if (response.statusCode == 200) {
       final List<dynamic> data = jsonDecode(utf8.decode(response.bodyBytes));
-      return data.map((json) => Contact.fromJson(json)).toList();
+      List<Contact> contacts = data.map((json) => Contact.fromJson(json)).toList();
+      for (var contact in contacts) {
+        if (contact.lastMessageTime != null) {
+          DateTime serverTime = contact.lastMessageTime!;
+          contact = contact.copyWith(lastMessageTime: serverTime.add(offset));
+        }
+      }
+      return contacts;
     } else {
       throw Exception('Failed to load contacts');
     }
diff --git a/lib/domain/services/crypto_service.dart b/lib/domain/services/crypto_service.dart
index 841032a..3a627d7 100644
--- a/lib/domain/services/crypto_service.dart
+++ b/lib/domain/services/crypto_service.dart
@@ -2,6 +2,7 @@ import 'dart:typed_data';
 import 'package:cryptography/cryptography.dart';
 import 'package:flutter_secure_storage/flutter_secure_storage.dart';
 import 'dart:convert';
+import 'package:chepuhagram/data/models/contact_model.dart';
 
 class CryptoService {
   final _storage = const FlutterSecureStorage();
@@ -123,6 +124,117 @@ class CryptoService {
     return base64Encode(nonce + encrypted.mac.bytes + encrypted.cipherText);
   }
 
+  static Future<String> decryptInIsolate(
+    String base64Data,
+    SecretKey sharedKey,
+  ) async {
+    final data = base64Decode(base64Data);
+    final aesGcm = AesGcm.with256bits();
+
+    final nonce = data.sublist(0, 12);
+    final mac = data.sublist(12, 28);
+    final cipherText = data.sublist(28);
+
+    final decrypted = await aesGcm.decrypt(
+      SecretBox(cipherText, nonce: nonce, mac: Mac(mac)),
+      secretKey: sharedKey,
+    );
+
+    return utf8.decode(decrypted);
+  }
+
+  static Future<List<Contact>> bulkDecryptContacts(
+    Map<String, dynamic> data,
+  ) async {
+    final List<Contact> contacts = data['contacts'];
+    final String privKey = data['privKey'];
+    final Map<int, SecretKey> cache = data['cache'];
+
+    final x25519 = X25519();
+    final aesGcm = AesGcm.with256bits();
+    final List<Contact> result = [];
+
+    // Вычисляем свою пару один раз
+    final myKeyPair = await x25519.newKeyPairFromSeed(base64Decode(privKey));
+
+    for (var contact in contacts) {
+      if (contact.lastMessage == null || contact.publicKey == null) {
+        result.add(contact);
+        continue;
+      }
+
+      try {
+        SecretKey sharedKey;
+        if (cache.containsKey(contact.id)) {
+          sharedKey = cache[contact.id]!;
+        } else {
+          final theirPubKey = SimplePublicKey(
+            base64Decode(contact.publicKey!),
+            type: KeyPairType.x25519,
+          );
+          sharedKey = await x25519.sharedSecretKey(
+            keyPair: myKeyPair,
+            remotePublicKey: theirPubKey,
+          );
+        }
+
+        // Дешифровка AES-GCM
+        final msgData = base64Decode(contact.lastMessage!);
+        final decrypted = await aesGcm.decrypt(
+          SecretBox(
+            msgData.sublist(28),
+            nonce: msgData.sublist(0, 12),
+            mac: Mac(msgData.sublist(12, 28)),
+          ),
+          secretKey: sharedKey,
+        );
+
+        result.add(
+          contact.copyWith(
+            lastMessage: utf8.decode(decrypted),
+            isLastMsgDecrypted: true,
+          ),
+        );
+      } catch (_) {
+        result.add(contact);
+      }
+    }
+    return result;
+  }
+
+  static Future<Map<int, List<int>>> computeSharedKeysTask(
+    Map<String, dynamic> params,
+  ) async {
+    final Map<int, String> isolateKeysMap = params['keysMap'];
+    final String isolatePrivKey = params['privKey'];
+
+    final x25519 = X25519();
+    final Map<int, List<int>> result = {};
+
+    final myKeyPair = await x25519.newKeyPairFromSeed(
+      base64Decode(isolatePrivKey),
+    );
+
+    for (var entry in isolateKeysMap.entries) {
+      try {
+        final theirPubKey = SimplePublicKey(
+          base64Decode(entry.value),
+          type: KeyPairType.x25519,
+        );
+
+        final sharedKey = await x25519.sharedSecretKey(
+          keyPair: myKeyPair,
+          remotePublicKey: theirPubKey,
+        );
+
+        result[entry.key] = await sharedKey.extractBytes();
+      } catch (_) {
+        continue;
+      }
+    }
+    return result;
+  }
+
   Future<(List<int>, String)?> encryptImage(
     List<int> fileBytes,
     SecretKey sharedKey,
diff --git a/lib/logic/contact_provider.dart b/lib/logic/contact_provider.dart
index 69e1479..09501ef 100644
--- a/lib/logic/contact_provider.dart
+++ b/lib/logic/contact_provider.dart
@@ -3,11 +3,18 @@ import '/data/models/contact_model.dart';
 import '/data/repositories/contact_repository.dart';
 import '/data/datasources/local_db_service.dart';
 import '/domain/services/crypto_service.dart';
+import 'dart:isolate';
+import 'dart:convert';
+import 'package:cryptography/cryptography.dart';
+import 'package:flutter/foundation.dart';
 
 class ContactProvider extends ChangeNotifier {
   final ContactRepository _repository = ContactRepository();
   final LocalDbService _localDbService = LocalDbService();
-  final CryptoService _cryptoService = CryptoService();
+  final CryptoService _cryptoService;
+
+  ContactProvider(this._cryptoService);
+  final Map<int, SecretKey> _sharedKeysCache = {};
   List<Contact> _contacts = [];
   List<Contact> _allContacts = [];
   bool _isLoading = false;
@@ -19,6 +26,11 @@ class ContactProvider extends ChangeNotifier {
   List<Contact> get allContacts => _allContacts;
   bool get isLoading => _isLoading;
   String? get error => _error;
+  Map<int, SecretKey> get sharedKeysCache => _sharedKeysCache;
+
+  void setSharedKey(int contactId, SecretKey key) {
+    _sharedKeysCache[contactId] = key;
+  }
 
   void setCurrentUserId(int? id) {
     _currentUserId = id;
@@ -29,7 +41,7 @@ class ContactProvider extends ChangeNotifier {
     return _currentUserId;
   }
 
-  Future<void> loadContacts() async {
+  Future<void> loadContacts({bool enrichContacts = true}) async {
     if (_isFirstLoad) {
       _isFirstLoad = false;
       _isLoading = true;
@@ -39,21 +51,23 @@ class ContactProvider extends ChangeNotifier {
 
     try {
       final allContacts = await _repository.fetchChatContacts();
-      // Фильтруем: исключаем себя (для основного списка - только чаты)
-      _contacts = allContacts
-          .where((contact) => contact.id != _currentUserId)
-          .toList();
+      final userIdCopy = _currentUserId;
+      _contacts = await Isolate.run(() {
+        return allContacts
+            .where((contact) => contact.id != userIdCopy)
+            .toList();
+      });
       _allContacts = _contacts;
       _isLoading = false;
       notifyListeners();
 
-      // Обогащаем превью последним сообщением из локальной БД, не блокируя UI.
-      _enrichContactsWithLastMessages();
+      if (enrichContacts) {
+        await _enrichContactsWithLastMessages();
+      }
     } catch (e) {
       _error = e.toString();
+      print("❌ ОШИБКА ПРИ ЗАГРУЗКЕ КОНТАКТОВ: $_error");
     } finally {
-      // Если ошибка — выходим из состояния загрузки тут.
-      // Если всё ок — `_isLoading` уже сброшен выше, чтобы показать список быстрее.
       if (_error != null) {
         _isLoading = false;
       }
@@ -61,7 +75,6 @@ class ContactProvider extends ChangeNotifier {
     }
   }
 
-  // Метод для получения всех контактов (исключая себя) для нового чата
   Future<void> loadAllContactsForNewChat() async {
     _isLoading = true;
     _error = null;
@@ -69,7 +82,6 @@ class ContactProvider extends ChangeNotifier {
 
     try {
       final allContacts = await _repository.fetchAllUsers();
-      // Фильтруем только исключение самого себя
       _allContacts = allContacts
           .where((contact) => contact.id != _currentUserId)
           .toList();
@@ -82,42 +94,30 @@ class ContactProvider extends ChangeNotifier {
   }
 
   Future<void> _enrichContactsWithLastMessages() async {
-    print("Начинаем обогащать контакты последними сообщениями из локальной БД... Для текущего пользователя ID: $_currentUserId");
-    final myId = _currentUserId;
-    if (myId == null) return;
-    print("Текущий пользователь ID: $myId");
+  final myPrivKeyBase64 = await _cryptoService.getPrivateKey();
+  if (myPrivKeyBase64 == null) return;
 
-    final myPrivKey = await _cryptoService.getPrivateKey();
+  // Создаем локальные копии для передачи
+  final contactsToProcess = List<Contact>.from(_contacts);
+  final cacheCopy = Map<int, SecretKey>.from(_sharedKeysCache);
 
-    final List<Contact> updated = List<Contact>.from(_contacts);
+  print('Avialable cache for contacts: ${cacheCopy.length}');
 
-    for (int i = 0; i < updated.length; i++) {
-      final contact = updated[i];
+  try {
+    final updatedContacts = await compute(
+      CryptoService.bulkDecryptContacts,
+      {
+        'contacts': contactsToProcess,
+        'privKey': myPrivKeyBase64,
+        'cache': cacheCopy,
+      },
+    );
 
-      // 1) Если сервер уже прислал lastMessage — попробуем расшифровать превью.
-      print(contact.lastMessage);
-      if (contact.lastMessage != null &&
-          contact.lastMessage!.isNotEmpty &&
-          myPrivKey != null &&
-          contact.publicKey != null) {
-        try {
-          final sharedSecret = await _cryptoService.deriveSharedSecret(
-            myPrivKey,
-            contact.publicKey!,
-          );
-          final decrypted = await _cryptoService.decryptMessage(
-            contact.lastMessage!,
-            sharedSecret,
-          );
-          updated[i] = contact.copyWith(lastMessage: decrypted);
-        } catch (_) {
-          // Если расшифровать не удалось — оставляем как есть, дальше попробуем локальную БД.
-        }
-      }
-    }
-
-    _contacts = updated;
-    _allContacts = updated;
+    _contacts = updatedContacts;
     notifyListeners();
+  } catch (e) {
+    print("Ошибка дешифровки: $e");
   }
 }
+
+}
diff --git a/lib/main.dart b/lib/main.dart
index 50a5340..a2466b5 100644
--- a/lib/main.dart
+++ b/lib/main.dart
@@ -22,15 +22,12 @@ final GlobalKey<NavigatorState> navigatorKey = GlobalKey<NavigatorState>();
 
 final RouteObserver<PageRoute> routeObserver = RouteObserver<PageRoute>();
 
-// Глобальная переменная для отслеживания текущего активного контакта в чате
 int? currentActiveChatContactId;
 
-// Глобальная переменная для хранения начального сообщения (при запуске из уведомления)
 RemoteMessage? initialMessage;
 
 // Ключ для SharedPreferences
 const String _notificationLaunchKey = 'notification_launch_data';
-// Защита от повторной обработки одного и того же payload при следующих запусках по иконке
 const String _lastHandledNotificationLaunchPayloadKey =
     'notification_last_handled_payload';
 
@@ -49,9 +46,6 @@ Future<void> _onSelectNotification(
         final prefs = await SharedPreferences.getInstance();
         final canonicalPayload = jsonEncode(data);
 
-        // Важно: не сохраняем payload в SharedPreferences, если можем сразу перейти в чат.
-        // Иначе при следующем обычном запуске (по иконке) останется "хвост" и приложение
-        // будет снова автопереходить в чат.
         if (context == null) {
           final lastHandled = prefs.getString(
             _lastHandledNotificationLaunchPayloadKey,
@@ -70,7 +64,6 @@ Future<void> _onSelectNotification(
           await prefs.remove(_notificationLaunchKey);
         }
 
-        // Navigate to chat with this contact (if context is ready)
         _navigateToChat(senderId);
       } else {
         print(
@@ -135,8 +128,6 @@ void main() async {
   WidgetsFlutterBinding.ensureInitialized();
   await Firebase.initializeApp();
 
-  // Проверяем, было ли приложение запущено из уведомления
-  // Добавляем небольшую задержку, чтобы Firebase полностью инициализировался
   await Future.delayed(const Duration(milliseconds: 500));
   initialMessage = await FirebaseMessaging.instance.getInitialMessage();
   print('Initial message from main() after delay: $initialMessage');
@@ -226,10 +217,17 @@ void main() async {
   runApp(
     MultiProvider(
       providers: [
+        Provider(create: (_) => CryptoService()),
+        Provider(create: (_) => SocketService()),
         ChangeNotifierProvider(create: (_) => AuthProvider()),
         ChangeNotifierProvider(create: (_) => ThemeProvider()),
-        ChangeNotifierProvider(create: (_) => ContactProvider()),
         Provider(create: (_) => SocketService()),
+
+        ChangeNotifierProvider(
+          create: (context) => ContactProvider(
+            context.read<CryptoService>(),
+          ),
+        ),
       ],
       child: const MyApp(),
     ),
diff --git a/lib/presentation/screens/chat_screen.dart b/lib/presentation/screens/chat_screen.dart
index 2205294..09a9064 100644
--- a/lib/presentation/screens/chat_screen.dart
+++ b/lib/presentation/screens/chat_screen.dart
@@ -494,6 +494,10 @@ class _ChatScreenState extends State<ChatScreen> {
         }
         _replyTo = null;
       });
+      Navigator.push(
+        context,
+        MaterialPageRoute(builder: (context) => ChatScreen(contact: targetContact,)),
+      );
     } catch (e) {
       if (!mounted) return;
       ScaffoldMessenger.of(context).showSnackBar(
@@ -754,11 +758,16 @@ class _ChatScreenState extends State<ChatScreen> {
   }
 
   void _handleIncomingMessage(Map<String, dynamic> data) async {
+    DateTime now = DateTime.now();
+
+    Duration offset = now.timeZoneOffset;
     // ACK от сервера: сообщение сохранено и получило server_id
     if (data['type'] == 'message_sent') {
       final tempId = int.tryParse(data['temp_id']?.toString() ?? '');
       final serverId = int.tryParse(data['server_id']?.toString() ?? '');
-      final ts = DateTime.tryParse(data['timestamp']?.toString() ?? '');
+      var ts = DateTime.tryParse(
+        data['timestamp']?.toString() ?? '',
+      )?.add(offset);
 
       if (tempId == null) return;
 
@@ -779,7 +788,9 @@ class _ChatScreenState extends State<ChatScreen> {
     if (data['type'] == 'message_delivered' && data.containsKey('temp_id')) {
       final tempId = int.tryParse(data['temp_id']?.toString() ?? '');
       final serverId = int.tryParse(data['server_id']?.toString() ?? '');
-      final ts = DateTime.tryParse(data['timestamp']?.toString() ?? '');
+      var ts = DateTime.tryParse(
+        data['timestamp']?.toString() ?? '',
+      )?.add(offset);
 
       if (tempId == null) return;
 
@@ -799,7 +810,9 @@ class _ChatScreenState extends State<ChatScreen> {
     // Доставка онлайн (получатель был в сети)
     if (data['type'] == 'message_delivered') {
       final messageId = int.tryParse(data['message_id']?.toString() ?? '');
-      final ts = DateTime.tryParse(data['timestamp']?.toString() ?? '');
+      var ts = DateTime.tryParse(
+        data['timestamp']?.toString() ?? '',
+      )?.add(offset);
       if (messageId == null) return;
 
       if (!mounted) return;
@@ -821,7 +834,9 @@ class _ChatScreenState extends State<ChatScreen> {
 
     if (data['type'] == 'message_edited') {
       final messageId = int.tryParse(data['message_id']?.toString() ?? '');
-      final ts = DateTime.tryParse(data['edited_at']?.toString() ?? '');
+      var ts = DateTime.tryParse(
+        data['edited_at']?.toString() ?? '',
+      )?.add(offset);
       if (messageId == null) return;
 
       final myPrivKey = await _cryptoService.getPrivateKey();
@@ -871,7 +886,9 @@ class _ChatScreenState extends State<ChatScreen> {
     if (data['type'] == 'message_read') {
       final messageId = int.tryParse(data['message_id'].toString());
       if (messageId == null) return;
-      final ts = DateTime.tryParse(data['timestamp']?.toString() ?? '');
+      var ts = DateTime.tryParse(
+        data['timestamp']?.toString() ?? '',
+      )?.add(offset);
 
       if (!mounted) return;
       setState(() {
@@ -943,15 +960,14 @@ class _ChatScreenState extends State<ChatScreen> {
                 isMe: false,
                 senderId: senderId,
                 receiverId: myId,
-                createdAt: DateTime.parse(data['timestamp']),
+                createdAt: DateTime.parse(data['timestamp']).add(offset),
                 status: MessageStatus.delivered,
                 replyToId: data['reply_to_id'] == null
                     ? null
                     : int.tryParse(data['reply_to_id'].toString()),
-                replyToText:
-                    data['reply_to_text'] != null
-                        ? data['reply_to_text'].toString()
-                        : null,
+                replyToText: data['reply_to_text'] != null
+                    ? data['reply_to_text'].toString()
+                    : null,
               ),
             );
           });
@@ -968,6 +984,9 @@ class _ChatScreenState extends State<ChatScreen> {
   }
 
   Future<void> _loadHistory() async {
+    DateTime now = DateTime.now();
+
+    Duration offset = now.timeZoneOffset;
     initialMessage = null; // Сбрасываем данные уведомления при загрузке ключа
     final prefs = await SharedPreferences.getInstance();
     await prefs.remove(_notificationLaunchKey);
@@ -992,10 +1011,10 @@ class _ChatScreenState extends State<ChatScreen> {
 
           final deliveredAt = msg['delivered_at'] == null
               ? null
-              : DateTime.tryParse(msg['delivered_at'].toString());
+              : DateTime.tryParse(msg['delivered_at'].toString())?.add(offset);
           final readAt = msg['read_at'] == null
               ? null
-              : DateTime.tryParse(msg['read_at'].toString());
+              : DateTime.tryParse(msg['read_at'].toString())?.add(offset);
 
           MessageStatus status = (msg['sender_id'] == myId)
               ? MessageStatus.sent
@@ -1015,7 +1034,7 @@ class _ChatScreenState extends State<ChatScreen> {
               isMe: msg['sender_id'] == myId,
               senderId: msg['sender_id'],
               receiverId: msg['receiver_id'],
-              createdAt: DateTime.parse(msg['timestamp']),
+              createdAt: DateTime.parse(msg['timestamp']).add(offset),
               status: status,
               replyToId: msg['reply_to_id'] == null
                   ? null
@@ -1024,7 +1043,7 @@ class _ChatScreenState extends State<ChatScreen> {
                   ? msg['reply_to_text'].toString()
                   : null,
               editedAt: msg['edited_at'] != null
-                  ? DateTime.tryParse(msg['edited_at'].toString())
+                  ? DateTime.tryParse(msg['edited_at'].toString())?.add(offset)
                   : null,
             ),
           );
@@ -1059,10 +1078,10 @@ class _ChatScreenState extends State<ChatScreen> {
 
         final deliveredAt = msg['delivered_at'] == null
             ? null
-            : DateTime.tryParse(msg['delivered_at'].toString());
+            : DateTime.tryParse(msg['delivered_at'].toString())?.add(offset);
         final readAt = msg['read_at'] == null
             ? null
-            : DateTime.tryParse(msg['read_at'].toString());
+            : DateTime.tryParse(msg['read_at'].toString())?.add(offset);
 
         MessageStatus status = (msg['sender_id'] == myId)
             ? MessageStatus.sent
@@ -1083,7 +1102,7 @@ class _ChatScreenState extends State<ChatScreen> {
             isMe: msg['sender_id'] == myId,
             senderId: msg['sender_id'],
             receiverId: msg['receiver_id'],
-            createdAt: DateTime.parse(msg['timestamp']),
+            createdAt: DateTime.parse(msg['timestamp']).add(offset),
             status: status,
             replyToId: msg['reply_to_id'] == null
                 ? null
@@ -1092,12 +1111,13 @@ class _ChatScreenState extends State<ChatScreen> {
                 ? msg['reply_to_text'].toString()
                 : null,
             editedAt: msg['edited_at'] != null
-                ? DateTime.tryParse(msg['edited_at'].toString())
+                ? DateTime.tryParse(msg['edited_at'].toString())?.add(offset)
                 : null,
           ),
         );
       }
       try {
+        await _localDbService.deleteChatHistory(widget.contact.id, myId);
         await _localDbService.saveMessages(history);
       } catch (e) {
         print("Ошибка сохранения истории в локальную базу: $e");
@@ -1119,7 +1139,6 @@ class _ChatScreenState extends State<ChatScreen> {
         Provider.of<SocketService>(context, listen: false).sendReadReceipt(id);
         _sentReadReceipts.add(id);
       }
-      await _localDbService.deleteChatHistory(widget.contact.id, myId);
     } catch (e) {
       print("Ошибка загрузки истории: $e");
       if (!mounted) return;
diff --git a/lib/presentation/screens/contacts_screen.dart b/lib/presentation/screens/contacts_screen.dart
index cba199a..6797b68 100644
--- a/lib/presentation/screens/contacts_screen.dart
+++ b/lib/presentation/screens/contacts_screen.dart
@@ -55,21 +55,28 @@ class _ContactsScreenState extends State<ContactsScreen> with RouteAware {
         'Setting current user ID in ContactProvider: ${authProvider.currentUserId}',
       );
       contactProvider.setCurrentUserId(authProvider.currentUserId);
-      contactProvider.loadContacts().then((_) {
-        print('Contacts loaded, checking targetChatId: ${widget.targetChatId}');
-        // После загрузки контактов проверить, нужно ли перейти к чату
-        if (widget.targetChatId != null) {
-          _navigateToTargetChat();
-        } else {
-          _checkSavedNotificationTarget();
-        }
-      });
+      _initContacts();
     });
     WidgetsBinding.instance.addPostFrameCallback((_) {
       _checkAppUpdate();
     });
   }
 
+  Future<void> _initContacts() async {
+    final contactProvider = context.read<ContactProvider>();
+    // Ждем завершения загрузки контактов
+    await contactProvider.loadContacts();
+
+    print('Contacts loaded, checking targetChatId: ${widget.targetChatId}');
+
+    // Дальнейшая логика выполнится только после того, как loadContacts завершится
+    if (widget.targetChatId != null) {
+      _navigateToTargetChat();
+    } else {
+      _checkSavedNotificationTarget();
+    }
+  }
+
   @override
   void didChangeDependencies() {
     super.didChangeDependencies();
diff --git a/lib/presentation/screens/splash_screen.dart b/lib/presentation/screens/splash_screen.dart
index 1f63a06..8326522 100644
--- a/lib/presentation/screens/splash_screen.dart
+++ b/lib/presentation/screens/splash_screen.dart
@@ -1,5 +1,6 @@
 import 'dart:async';
 import 'dart:io';
+import 'dart:math';
 
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
@@ -15,6 +16,13 @@ import 'package:firebase_messaging/firebase_messaging.dart';
 import 'package:chepuhagram/main.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 import 'dart:convert';
+import 'package:chepuhagram/domain/services/crypto_service.dart';
+import 'package:cryptography/cryptography.dart';
+import 'package:chepuhagram/data/repositories/contact_repository.dart ';
+import 'package:chepuhagram/data/models/contact_model.dart';
+import 'dart:isolate';
+import 'package:flutter/foundation.dart';
+import 'package:convert/convert.dart';
 
 class SplashScreen extends StatefulWidget {
   const SplashScreen({super.key});
@@ -29,6 +37,8 @@ class _SplashScreenState extends State<SplashScreen> {
 
   // Ключ для SharedPreferences
   static const String _notificationLaunchKey = 'notification_launch_data';
+  static const String _contactPublicKey = 'contact_public_key_';
+  static const String _contactSharedKey = 'contact_shared_key_';
 
   @override
   void initState() {
@@ -117,12 +127,59 @@ class _SplashScreenState extends State<SplashScreen> {
         // Проверяем, было ли приложение запущено из уведомления
         int? targetChatId =
             _targetChatId; // Сначала проверяем из onMessageOpenedApp
-
-        // Если не установлено, проверяем SharedPreferences
         if (targetChatId == null) {
           final prefs = await SharedPreferences.getInstance();
           final savedData = prefs.getString(_notificationLaunchKey);
 
+          try {
+            final contactProvider = context.read<ContactProvider>();
+            contactProvider.setCurrentUserId(authProvider.currentUserId);
+
+            await contactProvider.loadContacts(enrichContacts: false);
+
+            final myPrivKeyBase64 = await context
+                .read<CryptoService>()
+                .getPrivateKey();
+            if (myPrivKeyBase64 != null) {
+              final Map<int, String> keysToCompute = {};
+              for (var c in contactProvider.contacts) {
+                final savedKeyHex = prefs.getString(
+                  '$_contactSharedKey${c.id}',
+                );
+                final savedPubKey = prefs.getString(
+                  '$_contactPublicKey${c.id}',
+                );
+                if (savedKeyHex != null && savedPubKey == c.publicKey) {
+                  final bytes = base64Decode(
+                    savedKeyHex,
+                  );
+                  contactProvider.setSharedKey(c.id, SecretKey(bytes));
+                } else if (c.publicKey != null) {
+                  keysToCompute[c.id] = c.publicKey!;
+                }
+              }
+              print(
+                'Contacts with keys for isolate: ${keysToCompute.keys.toList()}',
+              );
+
+              final String privKey = myPrivKeyBase64;
+              final computedKeys = await compute(
+                CryptoService.computeSharedKeysTask,
+                {'keysMap': keysToCompute, 'privKey': privKey},
+              );
+
+              computedKeys.forEach((id, bytes) {
+                contactProvider.setSharedKey(id, SecretKey(bytes));
+                prefs.setString('$_contactSharedKey$id', base64Encode(bytes));
+                prefs.setString('$_contactPublicKey$id', keysToCompute[id]!);
+              });
+            }
+          } catch (e) {
+            print("Ошибка при загрузке контактов или вычислении ключей: $e");
+          }
+
+          // Если не установлено, проверяем SharedPreferences
+
           if (savedData != null) {
             try {
               final data = jsonDecode(savedData) as Map<String, dynamic>;
@@ -178,7 +235,7 @@ class _SplashScreenState extends State<SplashScreen> {
           try {
             final contactProvider = context.read<ContactProvider>();
             contactProvider.setCurrentUserId(authProvider.currentUserId);
-            await contactProvider.loadContacts();
+            await contactProvider.loadContacts(enrichContacts: false);
 
             final contact = contactProvider.contacts.firstWhere(
               (c) => c.id == targetChatId,
diff --git a/lib/presentation/widgets/contact_tile.dart b/lib/presentation/widgets/contact_tile.dart
index c4b7f8f..b024024 100644
--- a/lib/presentation/widgets/contact_tile.dart
+++ b/lib/presentation/widgets/contact_tile.dart
@@ -46,7 +46,7 @@ class ContactTile extends StatelessWidget {
         style: const TextStyle(fontWeight: FontWeight.bold, fontSize: 16),
       ),
       subtitle: Text(
-        contact.lastMessage ?? "Нет сообщений",
+        contact.isLastMsgDecrypted ? contact.lastMessage ?? "Нет сообщений" : (contact.lastMessage != null ? "Ожидание дешифровки..." : "Нет сообщений"),
         maxLines: 1,
         overflow: TextOverflow.ellipsis,
         style: const TextStyle(color: Colors.grey),
diff --git a/pubspec.lock b/pubspec.lock
index 0d2d4b2..6b345b0 100644
--- a/pubspec.lock
+++ b/pubspec.lock
@@ -57,6 +57,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.19.1"
+  convert:
+    dependency: "direct main"
+    description:
+      name: convert
+      sha256: b30acd5944035672bc15c6b7a8b47d773e41e2f17de064350988c5d02adb1c68
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.1.2"
   cross_file:
     dependency: transitive
     description:
diff --git a/pubspec.yaml b/pubspec.yaml
index 9ee5eff..39186d7 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -55,6 +55,7 @@ dependencies:
   dio: ^5.9.2
   package_info_plus: ^9.0.1
   open_filex: ^4.3.2
+  convert: ^3.1.2
 
 dev_dependencies:
   flutter_test:
diff --git a/srv/app/api/endpoints/users.py b/srv/app/api/endpoints/users.py
index 91b3106..d023bc4 100644
--- a/srv/app/api/endpoints/users.py
+++ b/srv/app/api/endpoints/users.py
@@ -6,7 +6,7 @@ from app.core.security import get_current_user
 from app.api import schemas
 from sqlalchemy import or_, and_, exists
 from sqlalchemy.exc import IntegrityError
-
+from app.websocket import connection_manager
 
 # бд
 def get_db():
@@ -146,7 +146,8 @@ async def update_privacy_settings(
         user_to_update.show_about = 1 if data.show_about else 0
     if data.show_username is not None:
         user_to_update.show_username = 1 if data.show_username else 0
-
+    if data.show_last_online is not None:
+        user_to_update.show_last_online = 1 if data.show_last_online else 0
     try:
         db.commit()
     except Exception:
@@ -169,6 +170,7 @@ async def get_privacy_settings(current_user: models.User = Depends(get_current_u
         "show_avatar": bool(current_user.show_avatar),
         "show_about": bool(current_user.show_about),
         "show_username": bool(current_user.show_username),
+        "show_last_online": bool(current_user.show_last_online),
     }
 
 
@@ -288,5 +290,12 @@ def get_user_by_id(
 
     if user.show_email:
         profile_data["email"] = user.email
+        
+    if user.id in connection_manager.active_connections:
+        profile_data["online"] = True
+    else:
+        profile_data["online"] = False
+        if user.show_last_online:
+            profile_data["last_online"] = user.last_online.isoformat() if user.last_online else None
 
     return profile_data
diff --git a/srv/app/db/models.py b/srv/app/db/models.py
index 9c78909..f0b44da 100644
--- a/srv/app/db/models.py
+++ b/srv/app/db/models.py
@@ -32,6 +32,8 @@ class User(Base):
     show_avatar = Column(Integer, nullable=False, server_default="1")
     show_about = Column(Integer, nullable=False, server_default="1")
     show_username = Column(Integer, nullable=False, server_default="1")
+    show_last_online = Column(Integer, nullable=False, server_default="1")
+    last_online = Column(DateTime(timezone=True), server_default=func.now(), onupdate=func.now())
     
 class Message(Base):
     __tablename__ = "messages"
@@ -93,6 +95,11 @@ def _ensure_sqlite_user_columns():
             conn.execute(text("ALTER TABLE users ADD COLUMN show_about INTEGER DEFAULT 1"))
         if "show_username" not in existing:
             conn.execute(text("ALTER TABLE users ADD COLUMN show_username INTEGER DEFAULT 1"))
+        if "show_last_online" not in existing:
+            conn.execute(text("ALTER TABLE users ADD COLUMN show_last_online INTEGER DEFAULT 1"))
+        if "last_online" not in existing:
+            conn.execute(text("ALTER TABLE users ADD COLUMN last_online DATETIME"))
+            conn.execute(text("UPDATE users SET last_online = datetime('now')"))
         conn.commit()
 
 
diff --git a/srv/app/websocket/connection_manager.py b/srv/app/websocket/connection_manager.py
index b494769..7dd6816 100644
--- a/srv/app/websocket/connection_manager.py
+++ b/srv/app/websocket/connection_manager.py
@@ -1,14 +1,15 @@
 from fastapi import HTTPException, status, APIRouter, WebSocket, WebSocketDisconnect, Query, Depends
 from app.core.security import test_token
 from typing import Dict
-from datetime import datetime
+from datetime import datetime, timezone
 import json
 from sqlalchemy.orm import Session
 from app.db import models
 from firebase_admin import messaging, credentials, exceptions
 import firebase_admin
 
-cred = credentials.Certificate("chepuhagram-6ca5d-firebase-adminsdk-fbsvc-cf8a5ad2f3.json")
+cred = credentials.Certificate(
+    "chepuhagram-6ca5d-firebase-adminsdk-fbsvc-cf8a5ad2f3.json")
 firebase_admin.initialize_app(cred)
 
 # бд
@@ -40,16 +41,25 @@ async def websocket_endpoint(websocket: WebSocket, token: str = Query(None), db:
     print("ПОДКЛЮЧЕНИЕ")
     await manager.connect(user_id, websocket)
     print("ПОДКЛЮЧЕНО")
+
+    db.query(models.User).filter(models.User.id == user_id).update({"last_online": datetime.now(timezone.utc)},
+                                                                   synchronize_session="fetch")
+    db.commit()
     try:
         while True:
             print("ОЖИДАНИЕ СООБЩЕНИЙ")
             data = await websocket.receive_text()
             message_data = json.loads(data)
             print(f"DEBUG: Получены данные: {message_data}")
+            
+            db.query(models.User).filter(models.User.id == user_id).update({"last_online": datetime.now(timezone.utc)},
+                                                                        synchronize_session="fetch")
+            db.commit()
 
             if message_data.get("type") == "private_message":
-                
-                user = db.query(models.User).filter(models.User.id == user_id).first()      
+
+                user = db.query(models.User).filter(
+                    models.User.id == user_id).first()
                 receiver_id = message_data.get("receiver_id")
                 temp_id = message_data.get("temp_id")
                 content = message_data.get("content")
@@ -150,7 +160,8 @@ async def websocket_endpoint(websocket: WebSocket, token: str = Query(None), db:
                         "detail": "message_id must be int",
                     })
                     continue
-                msg = db.query(models.Message).filter(models.Message.id == message_id).first()
+                msg = db.query(models.Message).filter(
+                    models.Message.id == message_id).first()
                 if msg is None or msg.sender_id != user_id:
                     continue
                 try:
@@ -186,7 +197,8 @@ async def websocket_endpoint(websocket: WebSocket, token: str = Query(None), db:
                         "detail": "message_id must be int",
                     })
                     continue
-                msg = db.query(models.Message).filter(models.Message.id == message_id).first()
+                msg = db.query(models.Message).filter(
+                    models.Message.id == message_id).first()
                 if msg is None or msg.sender_id != user_id:
                     continue
                 receiver_id = msg.receiver_id
@@ -210,7 +222,8 @@ async def websocket_endpoint(websocket: WebSocket, token: str = Query(None), db:
                 except (TypeError, ValueError):
                     continue
 
-                msg = db.query(models.Message).filter(models.Message.id == message_id).first()
+                msg = db.query(models.Message).filter(
+                    models.Message.id == message_id).first()
                 if msg is None:
                     continue
 
@@ -237,10 +250,15 @@ async def websocket_endpoint(websocket: WebSocket, token: str = Query(None), db:
         pass
     finally:
         manager.disconnect(user_id)
+        db.query(models.User).filter(models.User.id == user_id).update(
+            {"last_online": datetime.now()})
+        db.commit()
+        print("ОТКЛЮЧЕНИЕ")
 
 
 def send_fcm_notification(token, user_id, username, public_key, encrypted_text, timestamp):
-    print(f"DEBUG: Отправляем FCM уведомление пользователю {user_id} с токеном {token}")
+    print(
+        f"DEBUG: Отправляем FCM уведомление пользователю {user_id} с токеном {token}")
     message = messaging.Message(
         data={
             "type": "enc_message",
diff --git a/srv/main.py b/srv/main.py
index eae1369..2f680b1 100644
--- a/srv/main.py
+++ b/srv/main.py
@@ -10,7 +10,7 @@ app = FastAPI()
 app.include_router(auth.authRouter)
 app.include_router(users.usersRouter)
 app.include_router(messages.messagesRouter)
-app.include_router(media.mediaRouter)
+#app.include_router(media.mediaRouter)
 app.include_router(wsRouter)
 
 app.add_middleware(