Are you sure about that? This attack requires a js exec in browser to generate lots of traffic containing the cookie. It's a little impractical to use in a SIGINT capacity. My bet is still on precalculated DH like logjam attack.
Still the quote from @ioerror is: "RC4 is broken in real time" so that's either hyperbole or there is an attack better than 75 hours still out there.
NSA has been ahead of the state of art in cryptography, as the past has shown. So perhaps they already have an even more practical attack on RC4 for a long time.
Still the quote from @ioerror is: "RC4 is broken in real time" so that's either hyperbole or there is an attack better than 75 hours still out there.