Yes, but from the other angle, the number of unique 128K blocks that you can 
store on your ZFS pool, is actually finitely small, compared to the total 
space.  So the patterns you need to actually consider is not more than the 
physical limits of the universe.

Gregg Wonderly

On Jul 11, 2012, at 9:39 AM, Sašo Kiselkov wrote:

> 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

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