security: Fix security bugs, now ChronoChat should work with security

Change-Id: I81e7687bb4b02798ad9de3da34b36b0f011ffd66
diff --git a/TODO b/TODO
index 61f4d58..0c8dd35 100644
--- a/TODO
+++ b/TODO
@@ -1,2 +1,3 @@
 1. When clicking message balloon, the corresponding ChatDialog is raised.
-2. Check how does QT handle pointers created by new.
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+2. Fix mulitple occurance problem.
+3. Add the trust spanning tree.
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