[dm-crypt] length of keyfiles

Hi everybody,

I have seen that keyfiles can be used in cryptsetup up to 8 kB, but 
internally the master key is 512 bits at max. Is there any 
recommendation / increased security by using a random sequence of 8 kB 
w.r.t., let's say, one of just 64 bytes?

I understand that using one of 8kB will require more time than one of 64 
B when unlocking the volume, but... is the former really that much more 
secure than the latter?

Regards!
Felix
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