diff --git a/haruhi_dl/extractor/youtube.py b/haruhi_dl/extractor/youtube.py
index f80c82f85..9862ff00c 100644
--- a/haruhi_dl/extractor/youtube.py
+++ b/haruhi_dl/extractor/youtube.py
@@ -1085,14 +1085,11 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
 
     def _decrypt_signature_protected(self, s):
         a = list(s)
-        a = self.mess(a, 17)
+        a = self.mess(a, 20)
+        a = a[2:]
+        a = self.mess(a, 13)
         a.reverse()
         a = a[3:]
-        a = self.mess(a, 12)
-        a = a[1:]
-        a.reverse()
-        a = self.mess(a, 47)
-        a.reverse()
         return "".join(a)
 
     def _get_subtitles(self, video_id, webpage):