diff --git a/xiaosai/ecb_padding/crack.py b/xiaosai/ecb_padding/crack.py
index da72a61..cd09a65 100644
--- a/xiaosai/ecb_padding/crack.py
+++ b/xiaosai/ecb_padding/crack.py
@@ -1,37 +1,34 @@
 from pwn import *
-from flag import flag
-from Crypto.Cipher import AES
-from hashlib import sha256
 import base64
 
-flag = b''
 first_flag = b''
-wordlist = b'123456789qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM{}_'
+wordlist = b'0123456789qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM{}_'
 for i in range(16):
     for j in wordlist:
-        r = remote("127.0.0.1", 10002)
+        r = remote("172.20.14.117", 65311)
         payload = b'0'*(16-5) + b'0' * (15 - i)\
             + first_flag + j.to_bytes() + \
             b'0' * (15 - i)
         r.sendline(payload)
         cipher = r.recvline()
+        r.close()
         cipher = base64.b64decode(cipher)
         if cipher[16:32] == cipher[32:48]:
             first_flag = first_flag + j.to_bytes()
             break
-        
+
 last_flag = b''
 for i in range(21-16):
     for j in wordlist:
-        r = remote("127.0.0.1", 10002)
+        r = remote("172.20.14.117", 65311)
         payload = b'0' * 11 +  j.to_bytes() + \
             last_flag + b'0' * 27
         r.sendline(payload)
         cipher = r.recvline()
+        r.close()
         cipher= base64.b64decode(cipher)
         if cipher[16:32] == cipher[64:80]:
             last_flag = j.to_bytes() + last_flag
-            break
-                
+            break            
 
 print(first_flag + last_flag)
\ No newline at end of file
diff --git a/xiaosai/ecb_padding/dockerfile b/xiaosai/ecb_padding/dockerfile
new file mode 100644
index 0000000..7475f2f
--- /dev/null
+++ b/xiaosai/ecb_padding/dockerfile
@@ -0,0 +1,13 @@
+FROM python:latest
+
+RUN pip install pycryptodome -i https://pypi.tuna.tsinghua.edu.cn/simple
+
+COPY flag.py /app/
+
+COPY main.py /app/
+
+WORKDIR /app
+
+EXPOSE 10002
+
+CMD [ "python", "main.py" ]
\ No newline at end of file
diff --git a/xiaosai/ecb_padding/flag.py b/xiaosai/ecb_padding/flag.py
index abfa7cd..6cfcb0a 100644
--- a/xiaosai/ecb_padding/flag.py
+++ b/xiaosai/ecb_padding/flag.py
@@ -1 +1 @@
-flag = b'flag{eCb_is_not_SafE}'
\ No newline at end of file
+flag = b'0xFA{eCb_is_not_SafE}'
\ No newline at end of file
diff --git a/xiaosai/ecb_padding/main.py b/xiaosai/ecb_padding/main.py
index 0869208..18f87a9 100644
--- a/xiaosai/ecb_padding/main.py
+++ b/xiaosai/ecb_padding/main.py
@@ -38,12 +38,11 @@ class Task(socketserver.BaseRequestHandler):
         data = self.recv(prompt=b'')
         data = b'cqupt'+ data + flag 
         # len(flag) == 21
-        # wordlist = b'123456789qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM{}_'
+        # wordlist = b'0123456789qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM{}_'
         if len(data)%16 != 0:
             pad = b'0' * (16 - len(data)%16) 
             data = data + pad
         cipher = aes.encrypt(data)
-        print(aes.decrypt(cipher))
         cipher = base64.b64encode(cipher)
         self.send(cipher)