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Message-ID: <20150421032631.GA18820@openwall.com> Date: Tue, 21 Apr 2015 06:26:31 +0300 From: Solar Designer <solar@...nwall.com> To: discussions@...sword-hashing.net Subject: Argon2 modulo division Dmitry, all - It appears that Argon2 uses modulo division with arbitrary (and changing) divisors (usually not powers of 2). Argon2d applies this to secret-dependent integers. This is an extra source of timing leaks, on top of secret-dependent lookup addresses. Do we consider this a drawback? TwoCats had this too, but I avoided this maybe-drawback in yescrypt. Alexander
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