"Snow replied that when technologies are developed separately in parallel, the developers don't necessarily use the same terms for them."
Sure, and I invented cars 200 years ago, but I didn't call it a car so someone else got the credit.
The NSA may have a "deep staff of Ph.D. mathematicians and other cryptographic experts who work on securing traffic and breaking codes" but let's face it, government departments are not exactly known for being the most motivated of the various sectors, and that's further exacerbated if you know you aren't going to get credit for your work as opposed to being kept secret ... I mean, in academia, one of the major motivations for leading scientists is that they get widespread recognition for their work. I suspect the funding to maintain that "deep staff" of experts probably serves more to keep those experts from being more productive 'elsewhere'. And of course they have to maintain that they are 'ahead' if they want to keep getting funded year after year, so I'd take it with a pinch of salt.