Index: Lib/distutils/command/upload.py
===================================================================
--- Lib/distutils/command/upload.py	(revision 86868)
+++ Lib/distutils/command/upload.py	(working copy)
@@ -125,7 +125,7 @@
 
         if self.sign:
             data['gpg_signature'] = (os.path.basename(filename) + ".asc",
-                                     open(filename+".asc").read())
+                                     open(filename+".asc", "rb").read())
 
         # set up the authentication
         user_pass = (self.username + ":" + self.password).encode('ascii')