diff --git a/android/build.gradle b/android/build.gradle
index 887d0b9..03cd4b2 100644
--- a/android/build.gradle
+++ b/android/build.gradle
@@ -43,7 +43,7 @@ dependencies {
     implementation 'io.reactivex.rxjava2:rxjava:2.2.10'
     implementation 'io.reactivex.rxjava2:rxandroid:2.1.1'
 
-    implementation('com.github.bitmark-inc:libauk-kotlin:0.2.0') {
+    implementation('com.github.bitmark-inc:libauk-kotlin:0.2.1') {
         exclude group: 'com.google.protobuf'
         exclude module: 'jetified-protobuf-java'
     }
diff --git a/android/src/main/kotlin/com/bitmark/libauk_dart/LibAukDartPlugin.kt b/android/src/main/kotlin/com/bitmark/libauk_dart/LibAukDartPlugin.kt
index e6edda5..7a6b54f 100644
--- a/android/src/main/kotlin/com/bitmark/libauk_dart/LibAukDartPlugin.kt
+++ b/android/src/main/kotlin/com/bitmark/libauk_dart/LibAukDartPlugin.kt
@@ -9,8 +9,11 @@ import io.flutter.plugin.common.MethodCall
 import io.flutter.plugin.common.MethodChannel
 import io.flutter.plugin.common.MethodChannel.MethodCallHandler
 import io.flutter.plugin.common.MethodChannel.Result
+import io.reactivex.android.schedulers.AndroidSchedulers
 import io.reactivex.disposables.CompositeDisposable
+import io.reactivex.schedulers.Schedulers
 import org.web3j.crypto.RawTransaction
+import java.io.File
 import java.math.BigInteger
 import java.util.*
 
@@ -63,6 +66,12 @@ class LibAukDartPlugin : FlutterPlugin, MethodCallHandler {
             "signTransaction" -> {
                 signTransaction(call, result)
             }
+            "encryptFile" -> {
+                encryptFile(call, result)
+            }
+            "decryptFile" -> {
+                decryptFile(call, result)
+            }
             "exportMnemonicWords" -> {
                 exportMnemonicWords(call, result)
             }
@@ -278,6 +287,44 @@ class LibAukDartPlugin : FlutterPlugin, MethodCallHandler {
             .let { disposables.add(it) }
     }
 
+    private fun encryptFile(call: MethodCall, result: Result) {
+        val id: String? = call.argument("uuid")
+        val inputPath: String = call.argument("inputPath") ?: ""
+        val outputPath: String = call.argument("outputPath") ?: ""
+        LibAuk.getInstance().getStorage(UUID.fromString(id), context)
+            .encryptFile(File(inputPath), File(outputPath))
+            .subscribeOn(Schedulers.computation())
+            .observeOn(AndroidSchedulers.mainThread())
+            .subscribe({
+                val rev: HashMap<String, Any> = HashMap()
+                rev["error"] = 0
+                rev["msg"] = "Encrypt file success"
+                rev["data"] = outputPath
+                result.success(rev)
+            }, { error ->
+                result.error("Encrypt file failed", error.message, error)
+            }).let { disposables.add(it) }
+    }
+
+    private fun decryptFile(call: MethodCall, result: Result) {
+        val id: String? = call.argument("uuid")
+        val inputPath: String = call.argument("inputPath") ?: ""
+        val outputPath: String = call.argument("outputPath") ?: ""
+        LibAuk.getInstance().getStorage(UUID.fromString(id), context)
+            .decryptFile(File(inputPath), File(outputPath))
+            .subscribeOn(Schedulers.computation())
+            .observeOn(AndroidSchedulers.mainThread())
+            .subscribe({
+                val rev: HashMap<String, Any> = HashMap()
+                rev["error"] = 0
+                rev["msg"] = "Decrypt file success"
+                rev["data"] = outputPath
+                result.success(rev)
+            }, { error ->
+                result.error("Decrypt file failed", error.message, error)
+            }).let { disposables.add(it) }
+    }
+
     private fun exportMnemonicWords(call: MethodCall, result: Result) {
         val id: String? = call.argument("uuid")
         LibAuk.getInstance().getStorage(UUID.fromString(id), context)
diff --git a/lib/libauk_dart.dart b/lib/libauk_dart.dart
index 99e548f..f47dd6b 100644
--- a/lib/libauk_dart.dart
+++ b/lib/libauk_dart.dart
@@ -93,6 +93,30 @@ class WalletStorage {
     return res["data"];
   }
 
+  Future<String> encryptFile({
+    required String inputPath,
+    required String outputPath,
+  }) async {
+    Map res = await _channel.invokeMethod('encryptFile', {
+      "uuid": uuid,
+      "inputPath": inputPath,
+      "outputPath": outputPath,
+    });
+    return res["data"];
+  }
+
+  Future<String> decryptFile({
+    required String inputPath,
+    required String outputPath,
+  }) async {
+    Map res = await _channel.invokeMethod('decryptFile', {
+      "uuid": uuid,
+      "inputPath": inputPath,
+      "outputPath": outputPath,
+    });
+    return res["data"];
+  }
+
   Future<String> exportMnemonicWords() async {
     Map res =
         await _channel.invokeMethod('exportMnemonicWords', {"uuid": uuid});