28 bits of entropy? That's definitely within brute-force regions with CPU. Possibly even single-threaded CPU honestly. ------- GPU-level brute force is pushi

28 bits of entropy? That's definitely within brute-force regions with CPU. Possibly even single-threaded CPU honestly. ------- GPU-level brute force is pushing ~40-bits. Assuming ~1 week of solid compute, a 6 TFlop computer has ~3.7 sextillion compute cycles. Or alternatively, that's ~3 billion clock cycles (single thread) per check to reach 2^40 bits of entropy. More than easily doable for most simple brute-force computational problems IMO. If you go multi-GPU on top of that, you'll have even more computational work available.