diff --git a/README.md b/README.md
index 2de79a2..6d69a70 100644
--- a/README.md
+++ b/README.md
@@ -10,8 +10,9 @@
 
 
 [**Demo演示**](https://2fa.nezha.pp.ua)  https://2fa.nezha.pp.ua
-- 设置任何用户都能登录，不受登录白名单限制，正常部署，只有设置的白名单用户才能登录
-- 演示数据可以任意修改、删除；
+
+- 演示站默认允许任何用户登录，区别于正常部署只有白名单用户才允许登录
+- 演示站数据可以任意修改、删除
 
 ---
 
@@ -162,7 +163,7 @@ cd backend
 npx wrangler d1 execute 2fauth-db-dev --local --env dev --file=schema.sql
 
 # 4. 终端启动应用
-# 终端 1:
+```bash
 cd backend && npm run dev
 ```
 
diff --git a/backend/src/features/auth/authRoutes.ts b/backend/src/features/auth/authRoutes.ts
index 4e8a573..189ba1d 100644
--- a/backend/src/features/auth/authRoutes.ts
+++ b/backend/src/features/auth/authRoutes.ts
@@ -48,7 +48,7 @@ auth.post('/callback/:provider', async (c) => {
     const service = getService(c);
 
     // 调用 Service 层处理登录
-    const { token, userInfo } = await service.handleOAuthCallback(providerName, body);
+    const { token, userInfo, deviceKey } = await service.handleOAuthCallback(providerName, body);
 
     // 1. 设置 httpOnly 的鉴权 Cookie
     setCookie(c, 'auth_token', token, {
@@ -71,7 +71,8 @@ auth.post('/callback/:provider', async (c) => {
 
     return c.json({
         success: true,
-        userInfo
+        userInfo,
+        deviceKey
     });
 });
 
diff --git a/backend/src/features/auth/authService.ts b/backend/src/features/auth/authService.ts
index 51f0047..0a9f7c0 100644
--- a/backend/src/features/auth/authService.ts
+++ b/backend/src/features/auth/authService.ts
@@ -26,9 +26,9 @@ export class AuthService {
     }
 
     /**
-     * OAuth Callback 处理，进行鉴权并签发系统内部 JWT token
+     * OAuth Callback 处理，生成会话并返回附加参数
      */
-    async handleOAuthCallback(providerName: string, body: any): Promise<{ token: string, userInfo: OAuthUserInfo }> {
+    async handleOAuthCallback(providerName: string, body: any): Promise<{ token: string, userInfo: OAuthUserInfo, deviceKey: string }> {
         const provider = getOAuthProvider(providerName, this.env);
 
         let params: string | URLSearchParams;
@@ -53,7 +53,27 @@ export class AuthService {
         // 签发 Token
         const token = await this.generateSystemToken(userInfo);
 
-        return { token, userInfo };
+        // 附加客户端签名因子
+        const deviceKey = await this.generateDeviceKey(userInfo.id);
+
+        return { token, userInfo, deviceKey };
+    }
+
+    /**
+     * 生成客户端绑定标识
+     */
+    private async generateDeviceKey(userId: string): Promise<string> {
+        const secret = this.env.JWT_SECRET;
+        const encoder = new TextEncoder();
+        const keyMaterial = await crypto.subtle.importKey(
+            'raw',
+            encoder.encode(secret),
+            { name: 'HMAC', hash: 'SHA-256' },
+            false,
+            ['sign']
+        );
+        const signature = await crypto.subtle.sign('HMAC', keyMaterial, encoder.encode(userId + "device_salt_offline_key"));
+        return Array.from(new Uint8Array(signature)).map(b => b.toString(16).padStart(2, '0')).join('');
     }
 
     /**
diff --git a/frontend/src/features/auth/store/userStore.js b/frontend/src/features/auth/store/userStore.js
index b29317f..803dba2 100644
--- a/frontend/src/features/auth/store/userStore.js
+++ b/frontend/src/features/auth/store/userStore.js
@@ -2,6 +2,7 @@ import { defineStore } from 'pinia'
 import { ref } from 'vue'
 import { request } from '@/shared/utils/request'
 import { useVaultStore } from '@/features/vault/store/vaultStore'
+import { removeIdbItem } from '@/shared/utils/idb'
 
 export const useUserStore = defineStore('user', () => {
   const getStoredUser = () => {
@@ -19,13 +20,19 @@ export const useUserStore = defineStore('user', () => {
     localStorage.setItem('userInfo', JSON.stringify(info))
   }
 
-  const clearUserInfo = () => {
+  const clearUserInfo = async () => {
     userInfo.value = {}
     localStorage.removeItem('userInfo')
     localStorage.removeItem('secure_vault')
     localStorage.removeItem('backup_providers_cache')
 
-    // 锁定保险箱
+    // 清理本地持久化运行配置
+    try {
+      await removeIdbItem('device_salt')
+    } catch (e) {
+      console.error('Failed to remove device_salt from IDB', e)
+    }
+
     const vaultStore = useVaultStore()
     vaultStore.lock()
   }
@@ -36,7 +43,7 @@ export const useUserStore = defineStore('user', () => {
     } catch (e) {
       console.error('Logout request failed', e)
     } finally {
-      clearUserInfo()
+      await clearUserInfo()
     }
   }
 
@@ -48,7 +55,7 @@ export const useUserStore = defineStore('user', () => {
         return true
       }
     } catch (e) {
-      clearUserInfo()
+      await clearUserInfo()
       return false
     }
     return false
diff --git a/frontend/src/features/auth/views/oauthCallback.vue b/frontend/src/features/auth/views/oauthCallback.vue
index b002eb9..c785ef5 100644
--- a/frontend/src/features/auth/views/oauthCallback.vue
+++ b/frontend/src/features/auth/views/oauthCallback.vue
@@ -31,6 +31,7 @@ import { ref, onMounted } from 'vue'
 import { useRoute, useRouter } from 'vue-router'
 import { Loading } from '@element-plus/icons-vue'
 import { useUserStore } from '@/features/auth/store/userStore'
+import { setIdbItem } from '@/shared/utils/idb'
 
 const route = useRoute()
 const router = useRouter()
@@ -125,6 +126,11 @@ onMounted(async () => {
 
     if (data.success) {
       // 登录成功！Token 已写入 httpOnly Cookie
+      // 持久化客户端参数
+      if (data.deviceKey) {
+        await setIdbItem('device_salt', data.deviceKey)
+      }
+
       // 立即调用接口确认会话有效性，并更新用户信息
       const userStore = useUserStore()
       await userStore.fetchUserInfo()
diff --git a/frontend/src/features/backup/components/backupSettings.vue b/frontend/src/features/backup/components/backupSettings.vue
index cc38ccf..e957b6f 100644
--- a/frontend/src/features/backup/components/backupSettings.vue
+++ b/frontend/src/features/backup/components/backupSettings.vue
@@ -228,15 +228,11 @@ const isRestoring = ref(false)
 
 // --- API 交互 ---
 const fetchProviders = async () => {
-  // 1. 离线优先：尝试加载加密缓存 (仅在保险箱已解锁时有效)
-  if (vaultStore.isUnlocked) {
-    const cachedEncrypted = await vaultStore.getEncryptedBackupProviders()
-    if (cachedEncrypted && Array.isArray(cachedEncrypted)) {
-      providers.value = cachedEncrypted
-      // 有缓存时静默更新，不转圈圈
-    } else {
-      isLoading.value = true
-    }
+  // 1. 离线优先：尝试加载加密缓存
+  const cachedEncrypted = await vaultStore.getEncryptedBackupProviders()
+  if (cachedEncrypted && Array.isArray(cachedEncrypted)) {
+    providers.value = cachedEncrypted
+    // 有缓存时静默更新，不转圈圈
   } else {
     isLoading.value = true
   }
@@ -245,10 +241,8 @@ const fetchProviders = async () => {
     const res = await request('/api/backups/providers')
     if (res.success) {
       providers.value = res.providers
-      // 2. 更新加密缓存 (如果保险箱已解锁)
-      if (vaultStore.isUnlocked) {
-        await vaultStore.saveEncryptedBackupProviders(res.providers)
-      }
+      // 2. 更新加密缓存
+      await vaultStore.saveEncryptedBackupProviders(res.providers)
     }
   } finally { isLoading.value = false }
 }
diff --git a/frontend/src/features/vault/components/vaultList.vue b/frontend/src/features/vault/components/vaultList.vue
index e181131..5dc6628 100644
--- a/frontend/src/features/vault/components/vaultList.vue
+++ b/frontend/src/features/vault/components/vaultList.vue
@@ -1,12 +1,7 @@
 <template>
   <div class="vault-list-wrapper" style="min-height: 400px;">
-    <!-- 0. 保险箱锁定状态 -->
-    <div v-if="!vaultStore.isUnlocked" class="vault-lock-wrapper">
-      <VaultUnlock @unlocked="handleUnlocked" />
-    </div>
-
-    <!-- 1. 加载状态 (已解锁且本地缓存尚未挂载，或者正在首次/后台请求时但无数据) -->
-    <div v-else-if="(isLoading || isFetching) && vault.length === 0" class="loading-state" style="display: flex; flex-direction: column; justify-content: center; align-items: center; min-height: 400px; color: var(--el-text-color-secondary);">
+    <!-- 1. 加载状态 (本地缓存尚未挂载，或者正在首次/后台请求时但无数据) -->
+    <div v-if="(isLoading || isFetching) && vault.length === 0" class="loading-state" style="display: flex; flex-direction: column; justify-content: center; align-items: center; min-height: 400px; color: var(--el-text-color-secondary);">
       <el-icon class="is-loading" :size="48" style="margin-bottom: 20px; color: var(--el-color-primary);"><Loading /></el-icon>
       <p style="font-size: 16px; letter-spacing: 1px;">数据获取中, 请稍候...</p>
     </div>
@@ -179,9 +174,6 @@ import { useInfiniteQuery, useMutation, useQueryClient } from '@tanstack/vue-que
 import { generateTOTP } from '@/shared/utils/totp'
 import { copyToClipboard } from '@/shared/utils/common'
 
-// 异步引入解锁组件，避免循环依赖
-const VaultUnlock = defineAsyncComponent(() => import('@/features/vault/components/vaultUnlock.vue'))
-
 const emit = defineEmits(['switch-tab'])
 const queryClient = useQueryClient()
 const vaultStore = useVaultStore()
@@ -528,10 +520,8 @@ const copySecret = async () => {
 }
 
 onMounted(() => {
-  // 如果已经解锁 (例如从其他 Tab 切回来)，尝试加载缓存
-  if (vaultStore.isUnlocked) {
-    handleUnlocked()
-  }
+  // 组件加载即尝试读取本地离线数据
+  handleUnlocked()
   globalTimer = setInterval(updateVaultStatus, 1000)
 })
 
diff --git a/frontend/src/features/vault/components/vaultUnlock.vue b/frontend/src/features/vault/components/vaultUnlock.vue
deleted file mode 100644
index d8a1930..0000000
--- a/frontend/src/features/vault/components/vaultUnlock.vue
+++ /dev/null
@@ -1,159 +0,0 @@
-<template>
-  <div class="vault-unlock-container">
-    <el-card class="unlock-card" shadow="hover">
-      <div class="icon-wrapper">
-        <el-icon :size="48" color="#409EFF"><Lock /></el-icon>
-      </div>
-      
-      <h2 class="title">{{ vaultStore.hasVault ? '解锁本地缓存' : '设置缓存密码' }}</h2>
-      <p class="subtitle" style="margin-bottom: 10px;">
-        {{ vaultStore.hasVault 
-          ? '请输入您的缓存密码以加载本地离线数据' 
-          : '设置一个密码用于将 2FA 数据安全地缓存在本机' 
-        }}
-      </p>
-
-      <div class="form-container">
-        <el-input
-          v-model="password"
-          type="password"
-          show-password
-          placeholder="请输入密码"
-          @keyup.enter="handleSubmit"
-          :prefix-icon="Key"
-          size="large"
-        />
-        
-        <div v-if="!vaultStore.hasVault" style="margin-top: 15px;">
-          <el-input
-            v-model="confirmPassword"
-            type="password"
-            show-password
-            placeholder="再次确认密码"
-            @keyup.enter="handleSubmit"
-            :prefix-icon="Key"
-            size="large"
-          />
-        </div>
-
-        <div v-if="!vaultStore.hasVault" style="margin-top: 15px; text-align: left;">
-          <el-alert
-            title="缓存密码用途说明"
-            type="info"
-            :closable="false"
-            show-icon
-          >
-            <p style="margin: 5px 0 0 0; line-height: 1.5; font-size: 13px;">
-              此密码仅用于将 2FA 数据强加密保存到您的浏览器本地缓存中，防止<span style="color: var(--el-color-primary); font-weight: bold;">离线使用</span>时的明文泄露。<br/>
-              即使您意外遗忘了它，也可以随时<span style="color: var(--el-color-success); font-weight: bold;">清除并重置</span>，重新登录即可从云端恢复您的全部 2FA 数据。
-            </p>
-          </el-alert>
-        </div>
-
-        <div v-if="errorMsg" class="error-msg">
-          {{ errorMsg }}
-        </div>
-
-        <el-button 
-          type="primary" 
-          size="large" 
-          class="submit-btn" 
-          :loading="loading" 
-          @click="handleSubmit"
-        >
-          {{ vaultStore.hasVault ? '验证并进入' : '开启缓存保护' }}
-        </el-button>
-        
-        <div v-if="vaultStore.hasVault" class="reset-link">
-          <el-button link type="info" size="small" @click="handleResetPrompt">忘记密码？清除本地离线缓存</el-button>
-        </div>
-      </div>
-    </el-card>
-  </div>
-</template>
-
-<script setup>
-import { ref, onMounted, h } from 'vue'
-import { Lock, Key } from '@element-plus/icons-vue'
-import { useVaultStore } from '@/features/vault/store/vaultStore'
-import { ElMessage, ElMessageBox } from 'element-plus'
-
-const vaultStore = useVaultStore()
-
-const emit = defineEmits(['unlocked'])
-
-const password = ref('')
-const confirmPassword = ref('')
-const loading = ref(false)
-const errorMsg = ref('')
-
-onMounted(() => {
-  vaultStore.init()
-})
-
-const handleSubmit = async () => {
-  if (!password.value) {
-    errorMsg.value = '密码不能为空'
-    return
-  }
-
-  loading.value = true
-  errorMsg.value = ''
-
-  try {
-    if (vaultStore.hasVault) {
-      // 解锁模式
-      await vaultStore.unlock(password.value)
-      ElMessage.success('解锁成功')
-      emit('unlocked')
-    } else {
-      // 创建模式
-      if (password.value.length < 6) {
-        throw new Error('密码长度至少需要 6 位')
-      }
-      if (password.value !== confirmPassword.value) {
-        throw new Error('两次输入的密码不一致')
-      }
-      await vaultStore.setup(password.value)
-      ElMessage.success('保险箱创建成功')
-      emit('unlocked')
-    }
-  } catch (e) {
-    errorMsg.value = e.message
-    // 震动反馈 (如果支持)
-    if (navigator.vibrate) navigator.vibrate(200)
-  } finally {
-    loading.value = false
-  }
-}
-
-const handleResetPrompt = async () => {
-  try {
-    await ElMessageBox.confirm(
-      h('div', null, [
-        h('p', { style: 'margin-bottom: 10px; font-weight: 500;' }, '密码找不到了？没关系！'),
-        h('p', { style: 'font-size: 13px; color: var(--el-text-color-secondary); line-height: 1.6;' }, 
-          '点击下方按钮，系统将为您强制清理当前浏览器的本地加密缓存。清理完成后，您只需像初次访问一样，重新设置一个新的缓存密码即可。您的云端原始数据不会受到任何影响。'
-        )
-      ]),
-      '清除缓存锁',
-      {
-        confirmButtonText: '确定清除',
-        cancelButtonText: '点错了，返回',
-        type: 'warning',
-        center: true
-      }
-    )
-    
-    // User confirmed
-    localStorage.removeItem('secure_vault')
-    vaultStore.init()
-    password.value = ''
-    confirmPassword.value = ''
-    errorMsg.value = ''
-    ElMessage.success('本地缓存已完全清除，请重新设置密码')
-  } catch (err) {
-    if (err !== 'cancel') console.error(err)
-  }
-}
-</script>
\ No newline at end of file
diff --git a/frontend/src/features/vault/store/vaultStore.js b/frontend/src/features/vault/store/vaultStore.js
index ecfcda8..e902cf3 100644
--- a/frontend/src/features/vault/store/vaultStore.js
+++ b/frontend/src/features/vault/store/vaultStore.js
@@ -1,91 +1,61 @@
 import { defineStore } from 'pinia'
 import { ref } from 'vue'
 import { encryptDataWithPassword, decryptDataWithPassword } from '@/shared/utils/crypto'
+import { getIdbItem } from '@/shared/utils/idb'
 
 export const useVaultStore = defineStore('vault', () => {
-  const isUnlocked = ref(false)
+  const isUnlocked = ref(true) // 默认挂载状态
   const hasVault = ref(false)
   const isDirty = ref(false) // 标记缓存是否已因变更操作而过期
-  const _password = ref(null) // 仅保存在内存中，刷新页面即丢失
 
-  // 初始化检查：判断本地是否有加密数据，并尝试恢复会话
+  // 初始化检查
   const init = async () => {
     const encrypted = localStorage.getItem('secure_vault')
     hasVault.value = !!encrypted
-    if (!hasVault.value) return
-
-    // 模式 A: 尝试从 sessionStorage 恢复会话级解锁状态
-    const sessionPassword = sessionStorage.getItem('vault_session_key')
-    if (sessionPassword) {
-      try {
-        // 验证密码是否仍然有效
-        await decryptDataWithPassword(encrypted, sessionPassword)
-        // 验证通过，自动解锁
-        _password.value = sessionPassword
-        isUnlocked.value = true
-      } catch (e) {
-        // 密码无效，清除会话并锁定
-        lock()
-      }
-    }
   }
 
-  // 解锁保险箱
-  const unlock = async (password) => {
-    const encrypted = localStorage.getItem('secure_vault')
-    if (!encrypted) throw new Error('尚未创建保险箱')
-
+  // 获取本地运行时参数
+  const getDeviceKey = async () => {
     try {
-      await decryptDataWithPassword(encrypted, password)
-
-      _password.value = password
-      isUnlocked.value = true
-      sessionStorage.setItem('vault_session_key', password)
-      return true
+      return await getIdbItem('device_salt')
     } catch (e) {
-      throw new Error('密码错误')
+      return null
     }
   }
 
-  // 创建/重置保险箱
-  const setup = async (password, initialData = { vault: [] }) => {
-    const encrypted = await encryptDataWithPassword(initialData, password)
-    localStorage.setItem('secure_vault', encrypted)
-    _password.value = password
-    hasVault.value = true
-    isUnlocked.value = true
-    sessionStorage.setItem('vault_session_key', password)
-  }
-
-  // 锁定保险箱
-  const lock = () => {
-    _password.value = null
-    isUnlocked.value = false
-    sessionStorage.removeItem('vault_session_key')
-  }
-
-  // 获取数据 (使用内存密码解密)
+  // 加载数据
   const getData = async () => {
-    if (!isUnlocked.value || !_password.value) return null
+    const key = await getDeviceKey()
+    if (!key) throw new Error('设备授权信息已失效，请重新登录')
+
     const encrypted = localStorage.getItem('secure_vault')
     if (!encrypted) return { vault: [] }
-    return await decryptDataWithPassword(encrypted, _password.value)
+
+    try {
+      return await decryptDataWithPassword(encrypted, key)
+    } catch (e) {
+      // 若解密失败（极少情况如果用户清库或密钥被篡改），强行回退给空库
+      return { vault: [] }
+    }
   }
 
-  // 保存数据 (使用内存密码加密)
+  // 持久化数据
   const saveData = async (data) => {
-    if (!isUnlocked.value || !_password.value) throw new Error('保险箱已锁定')
-    const encrypted = await encryptDataWithPassword(data, _password.value)
+    const key = await getDeviceKey()
+    if (!key) throw new Error('设备授权信息已失效，请重新登录')
+    const encrypted = await encryptDataWithPassword(data, key)
     localStorage.setItem('secure_vault', encrypted)
+    hasVault.value = true
   }
 
   // --- 备份云配置的专属加密缓存 ---
   const getEncryptedBackupProviders = async () => {
-    if (!isUnlocked.value || !_password.value) return null
+    const key = await getDeviceKey()
+    if (!key) return null
     const encrypted = localStorage.getItem('backup_providers_cache')
     if (!encrypted) return null
     try {
-      const decrypted = await decryptDataWithPassword(encrypted, _password.value)
+      const decrypted = await decryptDataWithPassword(encrypted, key)
       return decrypted.providers || null
     } catch (e) {
       return null
@@ -93,11 +63,17 @@ export const useVaultStore = defineStore('vault', () => {
   }
 
   const saveEncryptedBackupProviders = async (providers) => {
-    if (!isUnlocked.value || !_password.value) return
-    const encrypted = await encryptDataWithPassword({ providers }, _password.value)
+    const key = await getDeviceKey()
+    if (!key) return
+    const encrypted = await encryptDataWithPassword({ providers }, key)
     localStorage.setItem('backup_providers_cache', encrypted)
   }
 
+  // 残留供部分旧UI避免报错的空函数 (即将被清理)
+  const unlock = async () => { return true }
+  const setup = async () => { }
+  const lock = () => { }
+
   return {
     isUnlocked,
     hasVault,
diff --git a/frontend/src/shared/utils/idb.js b/frontend/src/shared/utils/idb.js
new file mode 100644
index 0000000..2de3389
--- /dev/null
+++ b/frontend/src/shared/utils/idb.js
@@ -0,0 +1,54 @@
+// frontend/src/shared/utils/idb.js
+
+const DB_NAME = 'VaultAppDB'
+const STORE_NAME = 'app_key_store'
+const DB_VERSION = 1
+
+function openDB() {
+    return new Promise((resolve, reject) => {
+        const request = indexedDB.open(DB_NAME, DB_VERSION)
+
+        request.onerror = () => reject(request.error)
+        request.onsuccess = () => resolve(request.result)
+
+        request.onupgradeneeded = (event) => {
+            const db = event.target.result
+            if (!db.objectStoreNames.contains(STORE_NAME)) {
+                db.createObjectStore(STORE_NAME)
+            }
+        }
+    })
+}
+
+export async function setIdbItem(key, value) {
+    const db = await openDB()
+    return new Promise((resolve, reject) => {
+        const transaction = db.transaction(STORE_NAME, 'readwrite')
+        const store = transaction.objectStore(STORE_NAME)
+        const request = store.put(value, key)
+        request.onsuccess = () => resolve()
+        request.onerror = () => reject(request.error)
+    })
+}
+
+export async function getIdbItem(key) {
+    const db = await openDB()
+    return new Promise((resolve, reject) => {
+        const transaction = db.transaction(STORE_NAME, 'readonly')
+        const store = transaction.objectStore(STORE_NAME)
+        const request = store.get(key)
+        request.onsuccess = () => resolve(request.result)
+        request.onerror = () => reject(request.error)
+    })
+}
+
+export async function removeIdbItem(key) {
+    const db = await openDB()
+    return new Promise((resolve, reject) => {
+        const transaction = db.transaction(STORE_NAME, 'readwrite')
+        const store = transaction.objectStore(STORE_NAME)
+        const request = store.delete(key)
+        request.onsuccess = () => resolve()
+        request.onerror = () => reject(request.error)
+    })
+}