It's because cryptographers don't really have more imagination than, say, TV 
screen OEMs: bigger is better, simply because they don't know to do anything 
else. It doesn't matter that there is no bandwidth to fill that screen, that 
there is really no content worth watching, that the effective angular size of 
pixel is getting bigger ... they keep making 'em bigger.

Adding few bits of effective key length to 100+ bit key will get your paper 
published. Is it easy? No. Does it matter? It doesn't.

> What if a hash has 512-bit collision-resistance? What would
> that mean?
> That an attacker might spend about 2^512 resources to find
> 


      
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