diff --git a/.gitignore b/.gitignore
index f5ca0232..5fe6ef55 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,3 +8,4 @@
 .externalNativeBuild
 .cxx
 /*.jks
+.kotlin
diff --git a/CLAUDE.md b/CLAUDE.md
new file mode 100644
index 00000000..ed89b832
--- /dev/null
+++ b/CLAUDE.md
@@ -0,0 +1,99 @@
+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## 项目概述
+
+这是一个 Android 密钥认证测试应用,支持生成、保存、加载、解析和验证 Android 密钥和 ID 认证数据。该应用用于自测试,因此没有网络权限。
+
+## 构建和测试命令
+
+构建应用:
+```bash
+./gradlew assembleDebug          # 构建 debug 版本
+./gradlew assembleRelease        # 构建 release 版本
+```
+
+安装应用:
+```bash
+./gradlew installDebug           # 安装 debug 版本到设备
+```
+
+清理构建:
+```bash
+./gradlew clean                  # 清理构建输出
+```
+
+## 项目结构
+
+该项目包含两个模块:
+- `app`: 主应用模块
+- `stub`: 编译时依赖的存根库模块
+
+### 核心包结构
+
+- `io.github.vvb2060.keyattestation.attestation`: 认证核心逻辑
+  - `Attestation.java`: 抽象基类,解析认证证书
+  - `Asn1Attestation.java`: ASN.1 格式认证实现
+  - `EatAttestation.java`: EAT(Entity Attestation Token)格式实现
+  - `KnoxAttestation.java`: Samsung Knox 认证实现
+  - `AuthorizationList.java`: 授权列表解析
+  - `RevocationList.java`: 证书撤销列表验证
+
+- `io.github.vvb2060.keyattestation.keystore`: Android KeyStore 交互
+  - `KeyStoreManager.java`: KeyStore 管理器
+  - `AndroidKeyStore.java`: 本地 KeyStore 实现
+  - `RemoteProvisioning.java`: 远程配置支持
+
+- `io.github.vvb2060.keyattestation.repository`: 数据仓库层
+  - `AttestationRepository.java`: 认证数据仓库,处理证书生成和加载
+
+- `io.github.vvb2060.keyattestation.home`: 主界面相关
+  - `HomeViewModel.kt`: 主视图模型,管理认证状态和 StrongBox 选项
+  - `HomeActivity.kt`: 主活动
+
+## 技术要点
+
+### 认证类型支持
+
+应用支持三种认证格式:
+1. ASN.1 格式 (OID: 1.3.6.1.4.1.11129.2.1.17)
+2. EAT 格式 (OID: 1.3.6.1.4.1.11129.2.1.25)
+3. Knox 格式 (OID: 1.3.6.1.4.1.236.11.3.23.7)
+
+### 安全级别
+
+- `KM_SECURITY_LEVEL_SOFTWARE = 0`: 软件实现
+- `KM_SECURITY_LEVEL_TRUSTED_ENVIRONMENT = 1`: TEE 实现
+- `KM_SECURITY_LEVEL_STRONG_BOX = 2`: StrongBox 实现
+
+### 字节码转换
+
+应用使用 ASM 进行字节码转换,通过 `ClassVisitorFactory` 重命名以 `_rename` 结尾的类。
+
+### 依赖项
+
+主要依赖:
+- BouncyCastle (bcprov-jdk18on): 加密操作
+- Guava: 通用工具
+- CBOR (co.nstant.in:cbor): CBOR 格式解析
+- Rikka 系列库: Material Design 组件
+- Shizuku API: 系统级权限交互
+
+## 开发注意事项
+
+- 应用最低 SDK 版本为 24 (Android 7.0)
+- 目标 SDK 版本为 35
+- 使用 Java 21 和 Kotlin 2.0
+- Release 构建启用混淆和资源压缩
+- 应用没有网络权限,证书撤销数据嵌入在 APK 中
+- 支持 Samsung 特定的 Key Attestation 功能(samsungkeystoreutils)
+
+## 版本管理
+
+版本代码通过 git commit 数量自动生成:
+```bash
+git rev-list --count HEAD
+```
+
+当前版本名: 1.8.4
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 386349bc..64102a23 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -2,6 +2,9 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools">
 
+    <uses-permission android:name="android.permission.INTERNET" />
+    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
+
     <permission
         android:name="${applicationId}.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION"
         android:protectionLevel="signature"
diff --git a/app/src/main/java/io/github/vvb2060/keyattestation/attestation/RevocationList.java b/app/src/main/java/io/github/vvb2060/keyattestation/attestation/RevocationList.java
index 9f951263..33054c0d 100644
--- a/app/src/main/java/io/github/vvb2060/keyattestation/attestation/RevocationList.java
+++ b/app/src/main/java/io/github/vvb2060/keyattestation/attestation/RevocationList.java
@@ -1,14 +1,22 @@
 package io.github.vvb2060.keyattestation.attestation;
 
+import android.content.Context;
+import android.content.SharedPreferences;
 import android.os.Build;
+import android.util.Log;
 
 import org.json.JSONException;
 import org.json.JSONObject;
 
 import java.io.ByteArrayOutputStream;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.math.BigInteger;
+import java.net.HttpURLConnection;
+import java.net.URL;
 import java.nio.charset.StandardCharsets;
 import java.util.Locale;
 
@@ -16,7 +24,15 @@
 import io.github.vvb2060.keyattestation.R;
 
 public record RevocationList(String status, String reason) {
-    private static final JSONObject data = getStatus();
+    private static final String TAG = "RevocationList";
+    private static final String STATUS_FILE = "revocation_status.json";
+    private static final String PREFS_NAME = "revocation_list";
+    private static final String KEY_LAST_UPDATE = "last_update";
+    private static final String KEY_PUBLISH_TIME = "publish_time";
+
+    private static JSONObject data = null;
+    private static long lastUpdate = 0;
+    private static String publishTime = null;
 
     private static String toString(InputStream input) throws IOException {
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
@@ -34,37 +50,166 @@ private static String toString(InputStream input) throws IOException {
     private static JSONObject parseStatus(InputStream inputStream) throws IOException {
         try {
             var statusListJson = new JSONObject(toString(inputStream));
+            // 尝试获取发布时间
+            if (statusListJson.has("publishTime")) {
+                publishTime = statusListJson.getString("publishTime");
+            }
             return statusListJson.getJSONObject("entries");
         } catch (JSONException e) {
             throw new IOException(e);
         }
     }
 
-    private static JSONObject getStatus() {
+    private static synchronized JSONObject getStatus() {
+        if (data != null) {
+            return data;
+        }
+
+        var context = AppApplication.app;
+        var prefs = context.getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE);
+        lastUpdate = prefs.getLong(KEY_LAST_UPDATE, 0);
+        publishTime = prefs.getString(KEY_PUBLISH_TIME, null);
+
+        // 先尝试加载本地缓存的文件
+        File statusFile = new File(context.getFilesDir(), STATUS_FILE);
+        if (statusFile.exists()) {
+            try (var input = new FileInputStream(statusFile)) {
+                data = parseStatus(input);
+                return data;
+            } catch (IOException e) {
+                Log.w(TAG, "Failed to load cached status file", e);
+            }
+        }
+
+        // 加载内置的状态文件作为后备
+        var res = context.getResources();
+        try (var input = res.openRawResource(R.raw.status)) {
+            data = parseStatus(input);
+            return data;
+        } catch (IOException e) {
+            throw new RuntimeException("Failed to parse certificate revocation status", e);
+        }
+    }
+
+    /**
+     * 从网络更新吊销列表
+     * @return 是否更新成功
+     */
+    public static boolean updateFromNetwork() {
         var statusUrl = "https://android.googleapis.com/attestation/status";
         var resName = "android:string/vendor_required_attestation_revocation_list_url";
-        var res = AppApplication.app.getResources();
+        var context = AppApplication.app;
+        var res = context.getResources();
+
+        // 检查是否有自定义的URL
         // noinspection DiscouragedApi
         var id = res.getIdentifier(resName, null, null);
         if (id != 0) {
             var url = res.getString(id);
             if (!statusUrl.equals(url) && url.toLowerCase(Locale.ROOT).startsWith("https")) {
-                // no network permission, waiting for user report
-                throw new RuntimeException("unknown status url: " + url);
+                statusUrl = url;
             }
         }
-        try (var input = res.openRawResource(R.raw.status)) {
-            return parseStatus(input);
-        } catch (IOException e) {
-            throw new RuntimeException("Failed to parse certificate revocation status", e);
+
+        HttpURLConnection connection = null;
+        try {
+            URL url = new URL(statusUrl);
+            connection = (HttpURLConnection) url.openConnection();
+            connection.setConnectTimeout(10000);
+            connection.setReadTimeout(10000);
+            connection.setRequestMethod("GET");
+
+            int responseCode = connection.getResponseCode();
+            if (responseCode == HttpURLConnection.HTTP_OK) {
+                // 从 HTTP 响应头获取 Last-Modified 时间
+                String lastModifiedHeader = connection.getHeaderField("Last-Modified");
+                long serverLastModified = 0;
+                if (lastModifiedHeader != null) {
+                    try {
+                        serverLastModified = connection.getHeaderFieldDate("Last-Modified", 0);
+                    } catch (Exception e) {
+                        Log.w(TAG, "Failed to parse Last-Modified header", e);
+                    }
+                }
+
+                // 下载并保存到本地
+                File statusFile = new File(context.getFilesDir(), STATUS_FILE);
+                try (var input = connection.getInputStream();
+                     var output = new FileOutputStream(statusFile)) {
+                    byte[] buffer = new byte[8192];
+                    int length;
+                    while ((length = input.read(buffer)) != -1) {
+                        output.write(buffer, 0, length);
+                    }
+                }
+
+                // 重新加载数据
+                try (var input = new FileInputStream(statusFile)) {
+                    data = parseStatus(input);
+                }
+
+                // 如果从响应头获取到了服务器的最后修改时间，优先使用它
+                // 否则使用当前时间作为更新时间
+                var prefs = context.getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE);
+                if (serverLastModified > 0) {
+                    lastUpdate = serverLastModified;
+                } else {
+                    lastUpdate = System.currentTimeMillis();
+                }
+
+                prefs.edit()
+                    .putLong(KEY_LAST_UPDATE, lastUpdate)
+                    .putString(KEY_PUBLISH_TIME, publishTime)
+                    .apply();
+
+                Log.i(TAG, "Successfully updated revocation list from network. Last-Modified: " +
+                    (serverLastModified > 0 ? new java.util.Date(serverLastModified) : "not available"));
+                return true;
+            } else {
+                Log.w(TAG, "Failed to update revocation list: HTTP " + responseCode);
+                return false;
+            }
+        } catch (Exception e) {
+            Log.e(TAG, "Failed to update revocation list from network", e);
+            return false;
+        } finally {
+            if (connection != null) {
+                connection.disconnect();
+            }
+        }
+    }
+
+    /**
+     * 获取上次更新时间
+     * @return 时间戳(毫秒),如果从未更新则返回0
+     */
+    public static long getLastUpdateTime() {
+        if (lastUpdate == 0) {
+            var prefs = AppApplication.app.getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE);
+            lastUpdate = prefs.getLong(KEY_LAST_UPDATE, 0);
         }
+        return lastUpdate;
+    }
+
+    /**
+     * 获取吊销列表发布时间
+     * @return 发布时间字符串,如果未知则返回null
+     */
+    public static String getPublishTime() {
+        if (publishTime == null && data == null) {
+            getStatus(); // 确保数据已加载
+        }
+        return publishTime;
     }
 
     public static RevocationList get(BigInteger serialNumber) {
+        // 确保数据已加载
+        JSONObject statusData = getStatus();
+
         String serialNumberString = serialNumber.toString(16).toLowerCase();
         JSONObject revocationStatus;
         try {
-            revocationStatus = data.getJSONObject(serialNumberString);
+            revocationStatus = statusData.getJSONObject(serialNumberString);
         } catch (JSONException e) {
             return null;
         }
diff --git a/app/src/main/java/io/github/vvb2060/keyattestation/home/HomeFragment.kt b/app/src/main/java/io/github/vvb2060/keyattestation/home/HomeFragment.kt
index df10e546..2e813d34 100644
--- a/app/src/main/java/io/github/vvb2060/keyattestation/home/HomeFragment.kt
+++ b/app/src/main/java/io/github/vvb2060/keyattestation/home/HomeFragment.kt
@@ -250,6 +250,12 @@ class HomeFragment : AppFragment(), HomeAdapter.Listener, MenuProvider {
             R.id.menu_import_attest_key -> {
                 import.launch("text/xml")
             }
+            R.id.menu_update_revocation_list -> {
+                viewModel.updateRevocationList()
+            }
+            R.id.menu_revocation_list_info -> {
+                showRevocationListInfo()
+            }
             R.id.menu_about -> {
                 showAboutDialog()
             }
@@ -258,6 +264,17 @@ class HomeFragment : AppFragment(), HomeAdapter.Listener, MenuProvider {
         return true
     }
 
+    private fun showRevocationListInfo() {
+        val context = requireContext()
+        val info = viewModel.getRevocationListInfo()
+
+        AlertDialog.Builder(context)
+            .setTitle(R.string.revocation_list_info)
+            .setMessage(info)
+            .setPositiveButton(android.R.string.ok, null)
+            .show()
+    }
+
     private fun showAboutDialog() {
         val context = requireContext()
         val text = StringBuilder()
diff --git a/app/src/main/java/io/github/vvb2060/keyattestation/home/HomeViewModel.kt b/app/src/main/java/io/github/vvb2060/keyattestation/home/HomeViewModel.kt
index 65564d8b..ef5a5936 100644
--- a/app/src/main/java/io/github/vvb2060/keyattestation/home/HomeViewModel.kt
+++ b/app/src/main/java/io/github/vvb2060/keyattestation/home/HomeViewModel.kt
@@ -19,6 +19,7 @@ import androidx.lifecycle.viewmodel.initializer
 import androidx.lifecycle.viewmodel.viewModelFactory
 import com.samsung.android.security.keystore.AttestationUtils
 import io.github.vvb2060.keyattestation.AppApplication
+import io.github.vvb2060.keyattestation.attestation.RevocationList
 import io.github.vvb2060.keyattestation.keystore.KeyStoreManager
 import io.github.vvb2060.keyattestation.repository.AttestationRepository
 import io.github.vvb2060.keyattestation.repository.BaseData
@@ -221,4 +222,30 @@ class HomeViewModel(
 
         attestationData.postValue(result)
     }
+
+    fun updateRevocationList() = AppApplication.executor.execute {
+        val success = RevocationList.updateFromNetwork()
+        if (success) {
+            AppApplication.toast("Revocation list updated successfully")
+        } else {
+            AppApplication.toast("Failed to update revocation list")
+        }
+    }
+
+    fun getRevocationListInfo(): String {
+        val publishTime = RevocationList.getPublishTime()
+        val lastUpdate = RevocationList.getLastUpdateTime()
+
+        val sb = StringBuilder()
+        if (publishTime != null) {
+            sb.append("Publish time: $publishTime\n")
+        }
+        if (lastUpdate > 0) {
+            val dateFormat = java.text.SimpleDateFormat("yyyy-MM-dd HH:mm:ss", java.util.Locale.getDefault())
+            sb.append("Last updated: ${dateFormat.format(java.util.Date(lastUpdate))}")
+        } else {
+            sb.append("Using embedded revocation list")
+        }
+        return sb.toString()
+    }
 }
diff --git a/app/src/main/res/menu/home.xml b/app/src/main/res/menu/home.xml
index 9f7e3d0e..3830cc11 100644
--- a/app/src/main/res/menu/home.xml
+++ b/app/src/main/res/menu/home.xml
@@ -82,6 +82,16 @@
         android:showAsAction="never"
         android:title="@string/load_certs" />
 
+    <item
+        android:id="@+id/menu_update_revocation_list"
+        android:showAsAction="never"
+        android:title="@string/update_revocation_list" />
+
+    <item
+        android:id="@+id/menu_revocation_list_info"
+        android:showAsAction="never"
+        android:title="@string/revocation_list_info" />
+
     <item
         android:id="@+id/menu_about"
         android:showAsAction="never"
diff --git a/app/src/main/res/values-pt-rBR/strings.xml b/app/src/main/res/values-pt-rBR/strings.xml
index 358b5518..ab9f9079 100644
--- a/app/src/main/res/values-pt-rBR/strings.xml
+++ b/app/src/main/res/values-pt-rBR/strings.xml
@@ -15,6 +15,8 @@
     <string name="reset">Redefinir</string>
     <string name="load_certs">Carregar do arquivo</string>
     <string name="save_certs">Salvar em arquivo</string>
+    <string name="update_revocation_list">Atualizar lista de revogação</string>
+    <string name="revocation_list_info">Informações da lista de revogação</string>
     <string name="about">Sobre</string>
     <string name="open_source_info">Este software é de código aberto sob %2$s (%1$s).</string>
     <string name="install_shizuku">Instale o Shizuku para usar o Atestado de ID (%s).</string>
diff --git a/app/src/main/res/values-zh-rCN/strings.xml b/app/src/main/res/values-zh-rCN/strings.xml
index 914a6dcb..0581aea1 100644
--- a/app/src/main/res/values-zh-rCN/strings.xml
+++ b/app/src/main/res/values-zh-rCN/strings.xml
@@ -15,6 +15,8 @@
     <string name="reset">重置</string>
     <string name="load_certs">从文件加载</string>
     <string name="save_certs">保存到文件</string>
+    <string name="update_revocation_list">更新吊销列表</string>
+    <string name="revocation_list_info">吊销列表信息</string>
     <string name="about">关于</string>
     <string name="open_source_info">此软件是 %2$s 下的开源软件（%1$s）。</string>
     <string name="install_shizuku">安装 Shizuku 使用 ID 认证（%s）。</string>
diff --git a/app/src/main/res/values-zh-rTW/strings.xml b/app/src/main/res/values-zh-rTW/strings.xml
index be008194..b7167480 100644
--- a/app/src/main/res/values-zh-rTW/strings.xml
+++ b/app/src/main/res/values-zh-rTW/strings.xml
@@ -15,6 +15,8 @@
     <string name="reset">重設</string>
     <string name="load_certs">從檔案讀取</string>
     <string name="save_certs">儲存到檔案</string>
+    <string name="update_revocation_list">更新撤銷清單</string>
+    <string name="revocation_list_info">撤銷清單資訊</string>
     <string name="about">關於</string>
     <string name="open_source_info">此軟體是 %2$s 下的開源軟體（%1$s）。</string>
     <string name="install_shizuku">安裝 Shizuku 使用識別碼認證（%s）。</string>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 5620044a..2c36339e 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -15,6 +15,8 @@
     <string name="reset">Reset</string>
     <string name="load_certs">Load from file</string>
     <string name="save_certs">Save to file</string>
+    <string name="update_revocation_list">Update revocation list</string>
+    <string name="revocation_list_info">Revocation list info</string>
     <string name="about">About</string>
     <string name="open_source_info">This software is open source under %2$s (%1$s).</string>
     <string name="install_shizuku">Install Shizuku to use ID attestation (%s).</string>