Please see the discussion on the git list where Junio recommends against this technique:<p><a href="http://thread.gmane.org/gmane.comp.version-control.git/113124/focus=113221" rel="nofollow">http://thread.gmane.org/gmane.comp.version-control.git/11312...</a><p>Also, I notice you're using ECB. Shouldn't CBC be used?