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From: Heinz Diehl <htd@fancy-poultry.org>
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Subject: Re: [dm-crypt] maximum keyfile size
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On 28.06.2012, Milan Broz wrote: 

> Passphrase is interactively entered string
> (from real terminal, not stdint), keyfile is everything else.

So the length of a keyfile is equivalent to the length of a
passphrase, or is there any difference which should let me choose a
bigger keyfile than one containing 64 chars for "maximum security",
assumed I'm using 512 bit encryption?