diff --git a/devscripts/youtube_genalgo.py b/devscripts/youtube_genalgo.py
index 66019ee55..d4546758d 100644
--- a/devscripts/youtube_genalgo.py
+++ b/devscripts/youtube_genalgo.py
@@ -1,10 +1,14 @@
 #!/usr/bin/env python
+# encoding: utf-8
 
 # Generate youtube signature algorithm from test cases
 
 import sys
 
 tests = [
+    # 93 - vfl79wBKW 2013/07/20
+    (u"qwertyuioplkjhgfdsazxcvbnm1234567890QWERTYUIOPLKJHGFDSAZXCVBNM!@#$%^&*()_-+={[]}|:;?/>.<'`~\"€",
+     u".>/?;:|}][{=+-_)(*&^%$#@!MNBVCXZASDFGHJKLPOIUYTREWQ098765'321mnbvcxzasdfghjklpoiu"),
     # 92 - vflQw-fB4 2013/07/17
     ("qwertyuioplkjhgfdsazxcvbnm1234567890QWERTYUIOPLKJHGFDSAZXCVBNM!@#$%^&*()_-+={[]}|:;?/>.<'`~\"",
      "mrtyuioplkjhgfdsazxcvbnq1234567890QWERTY}IOPLKJHGFDSAZXCVBNM!@#$%^&*()_-+={[]\"|:;"),
diff --git a/youtube_dl/extractor/youtube.py b/youtube_dl/extractor/youtube.py
index 23a8097c5..e5f536e6f 100644
--- a/youtube_dl/extractor/youtube.py
+++ b/youtube_dl/extractor/youtube.py
@@ -416,7 +416,9 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
     def _decrypt_signature(self, s):
         """Turn the encrypted s field into a working signature"""
 
-        if len(s) == 92:
+        if len(s) == 93:
+            return s[86:29:-1] + s[88] + s[28:5:-1]
+        elif len(s) == 92:
             return s[25] + s[3:25] + s[0] + s[26:42] + s[79] + s[43:79] + s[91] + s[80:83]
         elif len(s) == 90:
             return s[25] + s[3:25] + s[2] + s[26:40] + s[77] + s[41:77] + s[89] + s[78:81]