404 at the moment, and not in Wayback. Google Cache finds it at:
http://webcache.googleusercontent.com/search?q=cache:https%3...
in turn listing the source as:
http://www.cl.cam.ac.uk/~pes20/nqsbtls-usenix-security15.pdf
You're getting a 404 from nqsb.io? This: https://nqsb.io/nqsbtls-usenix-security15.pdf works fine for me. What browser/cache setup do you have? Does a `curl` work?
I left another copy of the paper on my homepage at http://anil.recoil.org/papers/2015-usenixsec-nqsb.pdf, but Peter's version or the USENIX site should be fine as well.
Sorry for my delay responding; HN Notify just, very belatedly (10 days later), spit out a notification of your reply.
In case the information is of any value, this much later, the first link (at nqsb.io) works for me, now. (So does the second link.)
https://nqsb.io/nqsbtls-usenix-security15.pdf