diff --git a/app/src/main/ipc-handlers.js b/app/src/main/ipc-handlers.js
index 2390727..a216c8f 100644
--- a/app/src/main/ipc-handlers.js
+++ b/app/src/main/ipc-handlers.js
@@ -151,4 +151,26 @@ export function registerIpcHandlers() {
     return true;
   });
 
+  // ==================== 安全管理 ====================
+
+  ipcMain.handle('mqtt:get-security-status', () => {
+    return mqttManager.getSecurityStatus();
+  });
+
+  ipcMain.handle('mqtt:setup-master-password', (_, password) => {
+    return mqttManager.setupMasterPassword(password);
+  });
+
+  ipcMain.handle('mqtt:unlock', (_, password) => {
+    return mqttManager.unlock(password);
+  });
+
+  ipcMain.handle('mqtt:lock', () => {
+    return mqttManager.lock();
+  });
+
+  ipcMain.handle('mqtt:remove-master-password', (_, password) => {
+    return mqttManager.removeMasterPassword(password);
+  });
+
 }
diff --git a/app/src/main/mqtt-manager.js b/app/src/main/mqtt-manager.js
index 5ce2814..ac6966c 100644
--- a/app/src/main/mqtt-manager.js
+++ b/app/src/main/mqtt-manager.js
@@ -1,6 +1,8 @@
+import { randomBytes } from 'crypto';
 import { app } from 'electron';
 import { readFileSync, writeFileSync, existsSync, mkdirSync } from 'fs';
 import { join } from 'path';
+import { createPasswordVerifier, decryptSecret, deriveKey, encryptSecret, verifyPassword } from './security.js';
 
 import mqtt from 'mqtt';
 
@@ -36,6 +38,9 @@ class MqttManager {
     this.msgIdCounter = 0; // 用于生成唯一消息 id
     this.dataPath = join(app.getPath('userData'), 'frost-mqtt-data.json');
     this.quickSendList = [];
+    this.security = null;
+    this.masterKey = null;
+    this.locked = false;
     this.loadData();
   }
 
@@ -77,16 +82,30 @@ class MqttManager {
         let raw = readFileSync(this.dataPath, 'utf-8');
         let data = JSON.parse(raw);
 
+        this.security = data.security || null;
+        this.locked = Boolean(this.security?.enabled);
+
         if (data.servers) {
           data.servers.forEach((s) => {
+
+            let encryptedPassword = s.passwordEncrypted || '';
+
             s.status = 'disconnected';
+            s.password = this.locked ? '' : (s.password || '');
+
+            if (encryptedPassword) {
+              s.passwordEncrypted = encryptedPassword;
+            }
+
             s.topics = (s.topics || []).map((t) => ({
               ...t,
               id: t.id || 'topic_' + Date.now() + '_' + Math.random().toString(36).slice(2, 6),
               comment: t.comment ?? '',
               subscribed: false,
             }));
+
             this.servers.set(s.id, s);
+
           });
         }
 
@@ -124,8 +143,13 @@ class MqttManager {
     try {
 
       let data = {
+        security: this.security,
         servers: Array.from(this.servers.values()).map((s) => ({
           ...s,
+          password: this.security?.enabled ? undefined : (s.password || ''),
+          passwordEncrypted: this.security?.enabled && s.password
+            ? encryptSecret(s.password, this.masterKey)
+            : (this.security?.enabled ? s.passwordEncrypted || '' : undefined),
           status: 'disconnected',
           topics: s.topics.map((t) => ({ ...t, subscribed: false })),
         })),
@@ -214,11 +238,109 @@ class MqttManager {
 
   // ==================== 服务器管理 ====================
 
+  getSecurityStatus() {
+    return { enabled: Boolean(this.security?.enabled), locked: this.locked };
+  }
+
+  setupMasterPassword(password) {
+
+    this.assertPassword(password);
+
+    if (this.security?.enabled) {
+      throw new Error('主密码已设置');
+    }
+
+    let salt = randomBytes(16).toString('base64');
+
+    this.masterKey = deriveKey(password, Buffer.from(salt, 'base64'));
+    this.security = { enabled: true, salt, verifier: createPasswordVerifier(this.masterKey) };
+    this.locked = false;
+    this.saveData();
+
+    return this.getSecurityStatus();
+
+  }
+
+  unlock(password) {
+
+    if (!this.security?.enabled) {
+      return this.getSecurityStatus();
+    };
+
+    let key = deriveKey(password, Buffer.from(this.security.salt, 'base64'));
+
+    if (!verifyPassword(key, this.security.verifier)) {
+      throw new Error('主密码错误');
+    }
+
+    try {
+      this.servers.forEach((server) => {
+        server.password = server.passwordEncrypted ? decryptSecret(server.passwordEncrypted, key) : '';
+      });
+    } catch {
+      throw new Error('服务器密码解密失败，数据可能已损坏');
+    }
+
+    this.masterKey = key;
+    this.locked = false;
+
+    return this.getSecurityStatus();
+
+  }
+
+  lock() {
+
+    if (!this.security?.enabled || this.locked) {
+      return this.getSecurityStatus();
+    }
+
+    this.clients.forEach((_, id) => this.disconnect(id));
+    this.servers.forEach((server) => {
+      server.passwordEncrypted = server.password
+        ? encryptSecret(server.password, this.masterKey)
+        : server.passwordEncrypted || '';
+      server.password = '';
+    });
+    this.saveData();
+    this.masterKey = null;
+    this.locked = true;
+
+    return this.getSecurityStatus();
+
+  }
+
+  removeMasterPassword(password) {
+
+    if (!this.security?.enabled) {
+      return this.getSecurityStatus();
+    }
+
+    this.unlock(password);
+    this.security = null;
+    this.masterKey = null;
+    this.locked = false;
+    this.saveData();
+
+    return this.getSecurityStatus();
+
+  }
+
+  assertPassword(password) {
+    if (typeof password !== 'string' || password.length < 4) {
+      throw new Error('主密码至少需要 4 个字符');
+    }
+  }
+
+  assertUnlocked() {
+    if (this.locked) throw new Error('应用已锁定，请先解锁');
+  }
+
   /**
    * 获取所有服务器列表
    * @returns {MqttServer[]} 服务器配置数组
    */
   getServers() {
+    this.assertUnlocked();
     return Array.from(this.servers.values()).map((s) => ({
       ...s,
       password: s.password || '',
@@ -231,6 +353,7 @@ class MqttManager {
    * @returns {MqttServer | null} 服务器配置或 null
    */
   getServer(id) {
+    this.assertUnlocked();
     return this.servers.get(id) || null;
   }
 
@@ -293,6 +416,8 @@ class MqttManager {
    */
   addServer(config) {
 
+    this.assertUnlocked();
+
     let id = 'srv_' + Date.now() + '_' + Math.random().toString(36).slice(2, 6);
     let server = {
       id,
@@ -318,6 +443,8 @@ class MqttManager {
    */
   updateServer(id, config) {
 
+    this.assertUnlocked();
+
     let server = this.servers.get(id);
 
     if (!server) {
@@ -337,6 +464,7 @@ class MqttManager {
    * @param {string} id - 服务器 id
    */
   deleteServer(id) {
+    this.assertUnlocked();
     // 先断开连接
     this.disconnect(id);
     this.servers.delete(id);
@@ -350,7 +478,11 @@ class MqttManager {
    * @returns {ServerConfig[]} 服务器配置数组
    */
   exportServers() {
+
+    this.assertUnlocked();
+
     let schemaKeys = Object.keys(this.getServerConfigSchema());
+
     return Array.from(this.servers.values()).map((s) => {
       let exported = {};
       for (let key of schemaKeys) {
@@ -359,6 +491,7 @@ class MqttManager {
       exported.topics = (s.topics || []).map((t) => this.buildTopicExport(t));
       return exported;
     });
+
   }
 
   /**
@@ -381,6 +514,9 @@ class MqttManager {
    * @returns {MqttServer[]} 导入后的服务器列表
    */
   importServers(serverList) {
+
+    this.assertUnlocked();
+
     if (!Array.isArray(serverList)) {
       throw new Error('导入格式错误：必须是服务器配置数组');
     }
@@ -396,6 +532,7 @@ class MqttManager {
     this.publishHistory.clear();
 
     serverList.forEach((config) => {
+
       if (!config.name || !config.host) {
         return;
       }
@@ -411,10 +548,13 @@ class MqttManager {
       this.servers.set(id, server);
       this.messages.set(id, []);
       this.publishHistory.set(id, []);
+
     });
 
     this.saveData();
+
     return this.getServers();
+
   }
 
   // ==================== 快速发送 ====================
@@ -424,6 +564,7 @@ class MqttManager {
    * @returns {QuickSendItem[]} 快速发送项数组
    */
   getQuickSendList() {
+    this.assertUnlocked();
     return this.quickSendList;
   }
 
@@ -432,13 +573,19 @@ class MqttManager {
    * @param {QuickSendItem[]} list - 快速发送项数组
    */
   saveQuickSendList(list) {
+
+    this.assertUnlocked();
+
     if (!Array.isArray(list)) {
       return;
     }
+
     this.quickSendList = list.filter((item) => {
       return item && typeof item.id === 'string' && typeof item.topic === 'string';
     });
+
     this.saveData();
+
   }
 
   // ==================== 连接管理 ====================
@@ -450,6 +597,8 @@ class MqttManager {
    */
   connect(id) {
 
+    this.assertUnlocked();
+
     let server = this.servers.get(id);
 
     if (!server) {
@@ -551,6 +700,8 @@ class MqttManager {
    */
   disconnect(id) {
 
+    this.assertUnlocked();
+
     let client = this.clients.get(id);
 
     if (client) {
@@ -614,10 +765,15 @@ class MqttManager {
    * @returns {MqttTopic | null} 添加后的主题对象或 null
    */
   addTopic(serverId, topic, qos = 1, comment = '') {
+
+    this.assertUnlocked();
+
     let server = this.servers.get(serverId);
+
     if (!server) {
       return null;
     }
+
     if (server.topics.find((t) => t.topic === topic)) {
       return null;
     }
@@ -646,6 +802,8 @@ class MqttManager {
    */
   removeTopic(serverId, topic) {
 
+    this.assertUnlocked();
+
     let server = this.servers.get(serverId);
 
     if (!server) {
@@ -671,6 +829,8 @@ class MqttManager {
    */
   subscribe(serverId, topic) {
 
+    this.assertUnlocked();
+
     let server = this.servers.get(serverId);
 
     if (!server) {
@@ -695,6 +855,8 @@ class MqttManager {
    */
   unsubscribe(serverId, topic) {
 
+    this.assertUnlocked();
+
     let client = this.clients.get(serverId);
     let server = this.servers.get(serverId);
 
@@ -727,6 +889,8 @@ class MqttManager {
    */
   updateTopic(serverId, topicId, newTopic, newQos, comment = '') {
 
+    this.assertUnlocked();
+
     let server = this.servers.get(serverId);
 
     if (!server) {
@@ -785,6 +949,8 @@ class MqttManager {
    */
   subscribeAll(serverId) {
 
+    this.assertUnlocked();
+
     let client = this.clients.get(serverId);
     let server = this.servers.get(serverId);
 
@@ -835,6 +1001,8 @@ class MqttManager {
    */
   publish(serverId, topic, payload, opts = {}) {
 
+    this.assertUnlocked();
+
     let client = this.clients.get(serverId);
     let server = this.servers.get(serverId);
 
@@ -914,6 +1082,7 @@ class MqttManager {
    * @returns {MqttMessage[]} 消息数组
    */
   getMessages(serverId) {
+    this.assertUnlocked();
     return this.messages.get(serverId) || [];
   }
 
@@ -923,6 +1092,7 @@ class MqttManager {
    * @returns {PublishRecord[]} 发布历史数组
    */
   getPublishHistory(serverId) {
+    this.assertUnlocked();
     return this.publishHistory.get(serverId) || [];
   }
 
@@ -931,6 +1101,7 @@ class MqttManager {
    * @param {string} serverId - 服务器 id
    */
   clearMessages(serverId) {
+    this.assertUnlocked();
     this.messages.set(serverId, []);
     this.saveData();
   }
@@ -940,6 +1111,7 @@ class MqttManager {
    * @param {string} serverId - 服务器 id
    */
   clearPublishHistory(serverId) {
+    this.assertUnlocked();
     this.publishHistory.set(serverId, []);
     this.saveData();
   }
diff --git a/app/src/main/security.js b/app/src/main/security.js
new file mode 100644
index 0000000..49692c5
--- /dev/null
+++ b/app/src/main/security.js
@@ -0,0 +1,36 @@
+import { createCipheriv, createDecipheriv, createHash, randomBytes, scryptSync, timingSafeEqual } from 'crypto';
+
+const KEY_LENGTH = 32;
+const VERIFIER = 'frost-mqtt-master-password-v1';
+
+export function deriveKey(password, salt) {
+  return scryptSync(password, salt, KEY_LENGTH, { N: 16384, r: 8, p: 1 });
+}
+
+export function createPasswordVerifier(key) {
+  return createHash('sha256').update(key).update(VERIFIER).digest('hex');
+}
+
+export function verifyPassword(key, verifier) {
+  let expected = Buffer.from(createPasswordVerifier(key), 'hex');
+  let actual = Buffer.from(verifier || '', 'hex');
+  return actual.length === expected.length && timingSafeEqual(actual, expected);
+}
+
+export function encryptSecret(secret, key) {
+  let iv = randomBytes(12);
+  let cipher = createCipheriv('aes-256-gcm', key, iv);
+  let encrypted = Buffer.concat([cipher.update(secret, 'utf8'), cipher.final()]);
+  return `v1:${iv.toString('base64')}:${cipher.getAuthTag().toString('base64')}:${encrypted.toString('base64')}`;
+}
+
+export function decryptSecret(value, key) {
+  let parts = String(value || '').split(':');
+  if (parts.length !== 4 || parts[0] !== 'v1') throw new Error('加密数据格式无效');
+  let decipher = createDecipheriv('aes-256-gcm', key, Buffer.from(parts[1], 'base64'));
+  decipher.setAuthTag(Buffer.from(parts[2], 'base64'));
+  return Buffer.concat([
+    decipher.update(Buffer.from(parts[3], 'base64')),
+    decipher.final(),
+  ]).toString('utf8');
+}
diff --git a/app/src/preload/index.js b/app/src/preload/index.js
index 713c12e..7799528 100644
--- a/app/src/preload/index.js
+++ b/app/src/preload/index.js
@@ -8,6 +8,11 @@ import { electronAPI } from '@electron-toolkit/preload';
 const api = {
 
   // 服务器管理
+  getSecurityStatus: () => ipcRenderer.invoke('mqtt:get-security-status'),
+  setupMasterPassword: (password) => ipcRenderer.invoke('mqtt:setup-master-password', password),
+  unlock: (password) => ipcRenderer.invoke('mqtt:unlock', password),
+  lock: () => ipcRenderer.invoke('mqtt:lock'),
+  removeMasterPassword: (password) => ipcRenderer.invoke('mqtt:remove-master-password', password),
   getServers: () => ipcRenderer.invoke('mqtt:get-servers'),
   addServer: (config) => ipcRenderer.invoke('mqtt:add-server', config),
   updateServer: (id, config) => ipcRenderer.invoke('mqtt:update-server', id, config),
diff --git a/app/src/renderer/src/App.vue b/app/src/renderer/src/App.vue
index 669d14d..f30fccf 100644
--- a/app/src/renderer/src/App.vue
+++ b/app/src/renderer/src/App.vue
@@ -1,10 +1,11 @@
 <script setup>
 import { ref, onMounted } from 'vue';
-import { NLayout, NMessageProvider, NDialogProvider, NConfigProvider, NTabs, NTabPane, zhCN, dateZhCN } from 'naive-ui';
+import { NLayout, NMessageProvider, NDialogProvider, NConfigProvider, NTabs, NTabPane, NCard, NInput, NButton, NSpace, zhCN, dateZhCN } from 'naive-ui';
 import { useMqttStore } from './stores/mqtt.js';
 
 import Sidebar from './components/Sidebar.vue';
 import ServerModal from './components/ServerModal.vue';
+import SecurityModal from './components/SecurityModal.vue';
 import Dashboard from './views/Dashboard.vue';
 import Subscribe from './views/Subscribe.vue';
 import Publish from './views/Publish.vue';
@@ -40,13 +41,19 @@ const themeOverrides = {
   },
 };
 
-// 当前激活的标签页
+/** 当前激活的标签页 */
 const activeTab = ref('dashboard');
-// 是否显示服务器编辑弹窗
+
+/** 是否显示服务器编辑弹窗 */
 const showServerModal = ref(false);
-// 当前编辑的服务器数据，null 表示新增
+
+/** 当前编辑的服务器数据，null 表示新增 */
 const editServerData = ref(null);
 
+const showSecurityModal = ref(false);
+const unlockPassword = ref('');
+const unlockError = ref('');
+
 // 组件挂载时初始化 Store
 onMounted(async () => {
   await store.init();
@@ -76,6 +83,16 @@ function handleServerSaved() {
   // 刷新数据
 }
 
+async function handleUnlock() {
+  try {
+    await store.unlock(unlockPassword.value);
+    unlockPassword.value = '';
+    unlockError.value = '';
+  } catch (e) {
+    unlockError.value = e.message || '解锁失败';
+  }
+}
+
 /**
  * 切换标签页
  * @param {string} tab - 标签页名称
@@ -103,10 +120,15 @@ function handleSwitchTab(tab) {
           <Sidebar
             @add-server="handleAddServer"
             @edit-server="handleEditServer"
+            @lock="store.lock"
+            @security="showSecurityModal = true"
           />
 
           <!-- 主内容区 -->
-          <n-layout content-class="main-layout-content">
+          <n-layout
+            v-if="!store.security.value.locked"
+            content-class="main-layout-content"
+          >
             <n-tabs
               v-model:value="activeTab"
               type="line"
@@ -165,8 +187,41 @@ function handleSwitchTab(tab) {
             :edit-server="editServerData"
             @saved="handleServerSaved"
           />
+          <SecurityModal v-model:show="showSecurityModal" />
 
         </n-layout>
+        <div
+          v-if="store.security.value.locked"
+          class="lock-screen"
+        >
+          <n-card
+            title="应用已锁定"
+            class="lock-card"
+          >
+            <p>请输入主密码以继续使用 Frost MQTT Client</p>
+            <n-input
+              v-model:value="unlockPassword"
+              type="password"
+              show-password-on="click"
+              autofocus
+              @keyup.enter="handleUnlock"
+            />
+            <div
+              v-if="unlockError"
+              class="lock-error"
+            >{{ unlockError }}</div>
+            <n-space
+              justify="end"
+              style="margin-top: 16px"
+            >
+              <n-button
+                type="primary"
+                :disabled="!unlockPassword"
+                @click="handleUnlock"
+              >解锁</n-button>
+            </n-space>
+          </n-card>
+        </div>
       </n-dialog-provider>
     </n-message-provider>
   </n-config-provider>
@@ -215,6 +270,22 @@ html, body, #app {
   overflow: hidden;
 }
 
+.lock-screen {
+  position: absolute;
+  inset: 0;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  background: color-mix(in srgb, var(--n-color) 88%, transparent);
+  backdrop-filter: blur(2px);
+  z-index: 10;
+}
+
+.lock-card {
+  width: 360px;
+  max-width: 90vw;
+}
+
 .tab-content {
   box-sizing: border-box;
   padding: 0 0 16px 0;
diff --git a/app/src/renderer/src/components/SecurityModal.vue b/app/src/renderer/src/components/SecurityModal.vue
new file mode 100644
index 0000000..cf64712
--- /dev/null
+++ b/app/src/renderer/src/components/SecurityModal.vue
@@ -0,0 +1,96 @@
+<script setup>
+import { ref } from 'vue';
+import { NModal, NCard, NForm, NFormItem, NInput, NButton, NSpace, useMessage } from 'naive-ui';
+import { useMqttStore } from '../stores/mqtt.js';
+
+defineProps({
+  show: Boolean,
+});
+
+const emit = defineEmits(['update:show']);
+const store = useMqttStore();
+const msg = useMessage();
+const password = ref('');
+const confirmPassword = ref('');
+
+async function save() {
+
+  if (password.value.length < 4 || password.value !== confirmPassword.value) {
+    msg.error(password.value.length < 4 ? '主密码至少需要 4 个字符' : '两次输入的主密码不一致');
+    return;
+  }
+
+  try {
+    await store.setupMasterPassword(password.value);
+    password.value = '';
+    confirmPassword.value = '';
+    emit('update:show', false);
+    msg.success('主密码已设置，服务器密码已加密保存');
+  } catch (e) {
+    msg.error(e.message || '设置失败');
+  }
+
+}
+
+async function remove() {
+  try {
+    await store.removeMasterPassword(password.value);
+    password.value = '';
+    confirmPassword.value = '';
+    emit('update:show', false);
+    msg.success('主密码已移除');
+  } catch (e) {
+    msg.error(e.message || '移除失败');
+  }
+}
+</script>
+
+<template>
+  <n-modal
+    :show="show"
+    :mask-closable="false"
+    @update:show="$emit('update:show', $event)"
+  >
+    <n-card
+      style="width: 420px; max-width: 90vw"
+      :title="store.security.value.enabled ? '移除主密码' : '设置主密码'"
+    >
+      <n-form label-placement="top">
+        <n-form-item label="主密码">
+          <n-input
+            v-model:value="password"
+            type="password"
+            show-password-on="click"
+            autofocus
+          />
+        </n-form-item>
+        <n-form-item
+          v-if="!store.security.value.enabled"
+          label="确认主密码"
+        >
+          <n-input
+            v-model:value="confirmPassword"
+            type="password"
+            show-password-on="click"
+            @keyup.enter="save"
+          />
+        </n-form-item>
+      </n-form>
+      <template #footer>
+        <n-space justify="end">
+          <n-button @click="$emit('update:show', false)">取消</n-button>
+          <n-button
+            v-if="store.security.value.enabled"
+            type="error"
+            @click="remove"
+          >移除并解密保存</n-button>
+          <n-button
+            v-else
+            type="primary"
+            @click="save"
+          >设置</n-button>
+        </n-space>
+      </template>
+    </n-card>
+  </n-modal>
+</template>
diff --git a/app/src/renderer/src/components/Sidebar.vue b/app/src/renderer/src/components/Sidebar.vue
index 9d8b216..ec15e70 100644
--- a/app/src/renderer/src/components/Sidebar.vue
+++ b/app/src/renderer/src/components/Sidebar.vue
@@ -4,7 +4,7 @@ import { NLayoutSider, NButton, NTag, useMessage, useDialog } from 'naive-ui';
 import { useMqttStore } from '../stores/mqtt.js';
 
 // 组件事件定义
-const emit = defineEmits(['add-server', 'edit-server']);
+const emit = defineEmits(['add-server', 'edit-server', 'lock', 'security']);
 
 // 全局状态与消息/对话框 API
 const store = useMqttStore();
@@ -203,6 +203,22 @@ async function handleImportFile(event) {
             @click="handleExport"
           >导出配置</n-button>
         </div>
+        <div
+          class="sidebar-import-export"
+          :class="{ 'sidebar-single-action': !store.security.value.enabled }"
+        >
+          <n-button
+            v-if="store.security.value.enabled"
+            size="small"
+            block
+            @click="emit('lock')"
+          >锁定应用</n-button>
+          <n-button
+            size="small"
+            block
+            @click="emit('security')"
+          >{{ store.security.value.enabled ? '主密码设置' : '设置主密码' }}</n-button>
+        </div>
         <input
           ref="fileInput"
           type="file"
@@ -389,4 +405,8 @@ async function handleImportFile(event) {
   gap: 8px;
   margin-top: 8px;
 }
+
+.sidebar-single-action {
+  grid-template-columns: 1fr;
+}
 </style>
diff --git a/app/src/renderer/src/stores/mqtt.js b/app/src/renderer/src/stores/mqtt.js
index c840e05..7f5264b 100644
--- a/app/src/renderer/src/stores/mqtt.js
+++ b/app/src/renderer/src/stores/mqtt.js
@@ -103,6 +103,8 @@ const publishHistory = ref([]);
  */
 const loading = ref(false);
 
+const security = ref({ enabled: false, locked: false });
+
 /**
  * IPC 监听器清理函数集合
  * @type {Array<() => void>}
@@ -264,6 +266,12 @@ export function useMqttStore() {
 
     try {
 
+      security.value = await window.api.getSecurityStatus();
+
+      if (security.value.locked) {
+        return;
+      };
+
       let data = await window.api.getServers();
 
       servers.value = data;
@@ -279,6 +287,32 @@ export function useMqttStore() {
 
   }
 
+  async function unlock(password) {
+    await window.api.unlock(password);
+    security.value = await window.api.getSecurityStatus();
+    let data = await window.api.getServers();
+    servers.value = data;
+    sortServers();
+    servers.value.forEach((srv) => sortTopics(srv));
+    setupListeners();
+  }
+
+  async function setupMasterPassword(password) {
+    security.value = await window.api.setupMasterPassword(password);
+  }
+
+  async function lock() {
+    security.value = await window.api.lock();
+    servers.value = [];
+    activeServerId.value = null;
+    messages.value = [];
+    publishHistory.value = [];
+  }
+
+  async function removeMasterPassword(password) {
+    security.value = await window.api.removeMasterPassword(password);
+  }
+
   // ==================== 服务器管理 ====================
 
   /**
@@ -558,6 +592,7 @@ export function useMqttStore() {
     messages,
     publishHistory,
     loading,
+    security,
     // 计算属性
     connectedServers,
     totalTopics,
@@ -565,6 +600,10 @@ export function useMqttStore() {
     totalMessages,
     // 方法
     init,
+    unlock,
+    setupMasterPassword,
+    lock,
+    removeMasterPassword,
     setActiveServer,
     addServer,
     updateServer,