diff --git a/NEWS b/NEWS
index 8f6a480..0403fa0 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,8 @@
+Changes between 0.2.2 and 0.2.3  [XX xxx XXXX]
+
+  *) Deprecate authentication information when deleting the currently selected
+     application
+
 Changes between 0.2.1 and 0.2.2  [23 nov 2010]
 
   *) Fix build when cutter is not available or is disabled.
diff --git a/libfreefare/mifare_desfire.c b/libfreefare/mifare_desfire.c
index 717413a..f510a2a 100644
--- a/libfreefare/mifare_desfire.c
+++ b/libfreefare/mifare_desfire.c
@@ -556,6 +556,16 @@ mifare_desfire_delete_application (MifareTag tag, MifareDESFireAID aid)
 
     DESFIRE_TRANSCEIVE (tag, cmd, res);
 
+    /*
+     * If we have deleted the current application, we are not authenticated
+     * anymore.
+     */
+    if (MIFARE_DESFIRE (tag)->selected_application == (uint32_t)(aid->data[0] | aid->data[1] << 8 | aid->data[2] << 16)) {
+	free (MIFARE_DESFIRE (tag)->session_key);
+	MIFARE_DESFIRE (tag)->session_key = NULL;
+	MIFARE_DESFIRE (tag)->selected_application = 0x000000;
+    }
+
     return 0;
 }