diff --git a/saml/_version.py b/saml/_version.py
index 138c06d..b47a122 100644
--- a/saml/_version.py
+++ b/saml/_version.py
@@ -1,3 +1,3 @@
 # -*- coding: utf-8 -*-
-__version_info__ = (0, 8, 0)
+__version_info__ = (0, 9, 0)
 __version__ = '.'.join(map(str, __version_info__))
diff --git a/saml/schema/base.py b/saml/schema/base.py
index f429eef..fbe64c6 100644
--- a/saml/schema/base.py
+++ b/saml/schema/base.py
@@ -446,4 +446,4 @@ def deserialize(cls, xml):
 
     @classmethod
     def fromstring(cls, text):
-        return cls.deserialized(etree.XML(text))
+        return cls.deserialize(etree.XML(text))
diff --git a/saml/signature.py b/saml/signature.py
index c4c388c..604874f 100644
--- a/saml/signature.py
+++ b/saml/signature.py
@@ -146,9 +146,12 @@ def verify(xml, stream):
             xmlsec.KeyFormat.PEM,
             xmlsec.KeyFormat.CERT_PEM]:
         stream.seek(0)
-        key = xmlsec.Key.from_memory(stream, fmt)
-        if key is not None:
+        try:
+            key = xmlsec.Key.from_memory(stream, fmt)
             break
+        except ValueError:  
+            # xmlsec now throws when it can't load the key
+            pass
 
     # Set the key on the context.
     ctx.key = key