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Date: Wed, 17 Apr 2013 11:26:11 +0200
From: Simon Josefsson <>
To: Jeffrey Goldberg <>
Cc: "discussions\" <>
Subject: Re: [PHC] Let's not degenerate when if the PRF is too narrow for desired output

Jeffrey Goldberg <> writes:

> This is mostly me whining. I just got bitten by the fact that PBKDF2
> does weird stuff if you ask for more derived data than is natural for
> the PRF you give it.

Perhaps this can be converted into a requirement for a nicer KDF: the
cost to compute one bit of the output should be as high as computing the
entire output?


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