Just had a thought:
Embassies use intercontinental communications. I doubt they use local ISP's to accomplish this, so they probably route it through satellites.
So, an embassy beams its sensitive information up to space, and then downloads it back from space after it bounces around a bit to get the the US Mainland computer they happened to need.
How tight is a transmission aimed at a satellite? Is it pinpoint accurate to the receiving dish, or is it a cone that could be 100 yards across when it finally encounters the satellite?
Does the transmission go PAST the satellite and can be intercepted by another satellite BEHIND it?
A constantly changing private key structure that changed with every transmission would make it impossible to glean anything useful from 1-way eavesdropping I guess... but if you could intercept the transmission over-leak you could eventually decrypt it in theory...
...and does E.T. know all our secrets?