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>unless you are thinking about high level things, like "lots of traffic" -> "something going on", but tor won't help with that either

But is an embassy always only "phoning home"?

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Yes, it's good practice for an embassy to use a VPN to their home country for 100% of incoming and outgoing traffic (at least that's how I would do it).

Yes, if you are an embassy, you can be pretty sure that the host country is watching all of your traffic very carefully. Having all the traffic go via VPN is just sanity.

(and for really secure stuff you will want a channel with constant rate, constant size packets, as others said)

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