the spies seem to use obfuscated TLS
There is most certainly a high-profile absolutely* spy-proof communication system,
the spies themselves use it! - we couldn't have spies spying on spies now, that would be a loss of privacy, and compromise compartmentalised security or summat
* SAIC netEraser seems to be the highest profile spy-proof spy-comms program.
there were many court-cases over 'gabriel technologies' where big players tried to use patented spook communications technology.
just imagine if the jihadis got a hold of that type of sh*t
netEraser - CIA from the millennium - http://www.washingtonpost.com/wp-srv/WPcap/2000-02/16/030r-021600-idx.html