diff --git a/gnupg.py b/gnupg.py
index d48a371..a86231b 100644
--- a/gnupg.py
+++ b/gnupg.py
@@ -740,6 +740,14 @@ def handle_status(self, key, value):
             # if we want to check for signatures with expired key,
             # the relevant flag is EXPKEYSIG.
             pass
+        elif key == "EXPKEYSIG":
+            # signed with expired key
+            self.valid = False
+            self.key_id = value.split()[0]
+        elif key == "REVKEYSIG":
+            # signed with revoked key
+            self.valid = False
+            self.key_id = value.split()[0]
         else:
             raise ValueError("Unknown status message: %r" % key)