Goswin von Brederlow answered this question in http://lists.debian.org/debian-amd64/2005/07/msg00347.html.
"We are waiting on James Troup to activate amd64 on the security servers. The buildd is otherwise setup and running.
For the time being all security builds are uploaded to sarge-proposed-updates on amd64.debian.net and people should add that to the sources.list for now and just till sec.d.o gets reconfigured for us."
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