On 07/11/2012 04:27 PM, Gregg Wonderly wrote: > Unfortunately, the government imagines that people are using their home > computers to compute hashes and try and decrypt stuff. Look at what is > happening with GPUs these days. People are hooking up 4 GPUs in their > computers and getting huge performance gains. 5-6 char password space > covered in a few days. 12 or so chars would take one machine a couple of > years if I recall. So, if we had 20 people with that class of machine, we'd > be down to a few months. I'm just suggesting that while the compute space > is still huge, it's not actually undoable, it just requires some thought into > how to approach the problem, and then some time to do the computations. > > Huge space, but still finite…
There are certain physical limits which one cannot exceed. For instance, you cannot store 2^256 units of 32-byte quantities in Earth. Even if you used proton spin (or some other quantum property) to store a bit, there simply aren't enough protons in the entire visible universe to do it. You will never ever be able to search a 256-bit memory space using a simple exhaustive search. The reason why our security hashes are so long (256-bits, 512-bits, more...) is because attackers *don't* do an exhaustive search. -- Saso _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
