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Date: Tue, 13 Aug 2013 09:27:54 +0200
From: CodesInChaos <>
Subject: Re: [PHC] a sponge based approach

It's a fixed pattern, so the "save every sqrt(n)th" value technique which
reduces cost for the attacker to n^{3/2} applies to your construction,
compared with n^2 with scrypt.
For small f (i.e. f<<sqrt(m)) the attacker's cost is probably even lower.

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