Interesting.
I guess my basic question is, is there a subset of counter-surveillance actions that can be taken that, while not ensuring secure communications, forces eavesdropping parties to take 'radical' measures in order to obtain the desired information? In other words, if they have to deploy a black-bag operation every few weeks, then that makes the odds of them being 'outed' sooner rather than later much greater. It might even deter survelliance except "when it really counts".
But then again, if the walls really have ears, then there's not much that can be done. Perhaps Koffi Annan was completely aware of this but counted on normal diplomatic protocol to prevent embarrasing and public exposures...(and that may be all that's really needed at the UN after all...)
How about a pseudo random "conversation" generator appliance for the person trying to mask their speech. If it closely models the vocal tract, language and language characteristics of the speaker it might be extremely difficult to remove as background noise.
steve
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