diff --git a/python/decrpt.py b/python/decrpt.py
new file mode 100644
index 0000000..d1802a2
--- /dev/null
+++ b/python/decrpt.py
@@ -0,0 +1,51 @@
+import ctypes
+import hashlib
+import hmac
+
+# pip install pycryptodome
+from Crypto.Cipher import AES
+
+
+def decrypt(password, input_file, out_file):
+    password = bytes.fromhex(password.replace(' ', ''))
+    with open(input_file, 'rb') as (f):
+        blist = f.read()
+    print(len(blist))
+    salt = blist[:16]
+    key = hashlib.pbkdf2_hmac('sha1', password, salt, DEFAULT_ITER, KEY_SIZE)
+    first = blist[16:DEFAULT_PAGESIZE]
+    mac_salt = bytes([x ^ 58 for x in salt])
+    mac_key = hashlib.pbkdf2_hmac('sha1', key, mac_salt, 2, KEY_SIZE)
+    hash_mac = hmac.new(mac_key, digestmod='sha1')
+    hash_mac.update(first[:-32])
+    hash_mac.update(bytes(ctypes.c_int(1)))
+    if hash_mac.digest() == first[-32:-12]:
+        print('decrypt success')
+    else:
+        print('password error')
+        return
+    blist = [blist[i:i + DEFAULT_PAGESIZE] for i in range(DEFAULT_PAGESIZE, len(blist), DEFAULT_PAGESIZE)]
+    with open(out_file, 'wb') as (f):
+        f.write(SQLITE_FILE_HEADER)
+        t = AES.new(key, AES.MODE_CBC, first[-48:-32])
+        f.write(t.decrypt(first[:-48]))
+        f.write(first[-48:])
+        for i in blist:
+            t = AES.new(key, AES.MODE_CBC, i[-48:-32])
+            f.write(t.decrypt(i[:-48]))
+            f.write(i[-48:])
+
+
+def main():
+    password = '565735E30E474DA09250CB5AA047E3940FFA1C6F767C4263B13ABB512933DA49'
+    input_file = 'C:/var/Applet.db'
+    out_file = 'c:/var/out/Applet.db'
+    decrypt(password, input_file, out_file)
+
+
+if __name__ == '__main__':
+    SQLITE_FILE_HEADER = bytes('SQLite format 3', encoding='ASCII') + bytes(1)
+    KEY_SIZE = 32
+    DEFAULT_PAGESIZE = 4096
+    DEFAULT_ITER = 64000
+    main()