The code-ring on the golf course
> Basically, the NSA is able to decrypt most of the internet
Having the ability to pick a single piece of (encrypted) internet traffic, at will, and decrypt it is a long way from being able to decrypt *every* piece of internet traffic, scan it for content and act on it. In real time.
Havng a piece of encrypted data handed to you and being asked to apply your decoding "magic" to it is one element of the NSA's work. However they still have to be able to isolate that significant piece of encrypted traffic from the billions of others: comparable to finding the one blade of grass on a golf course that has a coded message written on it.
That job of knowing which message to apply their brute force (or "cheating" - how ungentlemanly of them) processes is a monumentally different and much, much bigger problem. Sure: they can find stuff if they know where to look. However that knowing is still dependent on and limited to other more traditional methods of surveillance. There's just too much ordinary stuff, flying around as encryrpted data, or steganographic plain messages concealing sensitive information, for the NSA or any other body to check it all.
In this case, security through obscurity does work.