You can do this on yours. Just have the client and server add an extra "2" after the challenge key or something. A different client which extracts the challenge key and does its own processing will only generate invalid responses.
Cool, so then that invalidates the ASIC problem, right?
My earlier idea was to imagine that each day Anubis picks an entirely different problem-class. Ex: one day it is Sha256, the next it is prime factorization, the next it is twin-prime-finding, the next it is cracking elliptic curves, the next it is some kind of sorting / information theory problem...
All with the goal of adapting constantly so that scrapers have a harder time optimizing for the PoW problem (i.e. with Sha256 ASICs)
