I wonder if you could tie up the NSA with honeypot spam? Just send tons of encrypted data from a bunch of different sources, 24/7. You could even hide your legitimate messages within it.
Does a system like that exist? A constant stream of random bytes, some of it real information, most of it not. Only those intended to be the recipient know where to look.
It's often possible to distinguish random data from encrypted data using something like a chi square test. However, if you just encrypted random bytes, then it would look just as encrypted as your real data (because it is). Alternatively, you could just encrypt spam emails (it'd be cute if a system like this encrypted and sent every spam email that you received).
...system like this encrypted and sent every spam email that you received
I wanted to like this proposal, but then I realized these encrypted spams have to be sent somewhere. Any ethical target would be too easy for "the bad guys" to filter. Oh well.
Does a system like that exist? A constant stream of random bytes, some of it real information, most of it not. Only those intended to be the recipient know where to look.