diff --git a/pyga4/analytic/data_transform.py b/pyga4/analytic/data_transform.py
index 09e3749..de0ddcd 100644
--- a/pyga4/analytic/data_transform.py
+++ b/pyga4/analytic/data_transform.py
@@ -1,47 +1,10 @@
 import base64
-import json
 from datetime import datetime, timedelta, timezone
 from typing import Union, Iterable
 
-from Crypto.Cipher import AES
-from Crypto.Util.Padding import unpad
-
 
 class Transformer:
     """Transform the data of GA4"""
-
-    @staticmethod
-    def decryptData(
-        encoded_data: Union[str, Iterable],
-        key = b'secret_key'
-    ) -> Union[str, list]:
-        """ Decrypt Data (string or json)
-        """
-        if isinstance(encoded_data, str):
-            # 將 base64 編碼的數據解碼並進行解密
-            encrypted_data = base64.b64decode(encoded_data)
-
-            # 進行 Zero Padding
-            key = key.ljust(16, b'\x00')
-
-            # 創建 AES 解密器
-            cipher = AES.new(key, AES.MODE_CBC, key)
-
-            decrypted_data = unpad(cipher.decrypt(encrypted_data), AES.block_size)
-
-            try:
-                json_data = decrypted_data.decode()
-                data = json.loads(json_data)
-            except (json.JSONDecodeError, UnicodeDecodeError):
-                data = decrypted_data.decode()
-
-            return data
-
-        decrypted_list = []
-        for item in encoded_data:
-            decrypted_list.append(Transformer.decryptData(item, key))
-        return decrypted_list
-
     @staticmethod
     def timestamp_to_datetime(
         ga4_timestamp: Union[str, Iterable]