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Date: Thu, 13 Mar 2014 11:45:39 -0700
From: Tony Arcieri <>
To: "" <>
Subject: Re: [PHC] "Why I Don't Recommend Scrypt"

On Thu, Mar 13, 2014 at 11:42 AM, Patrick Mylund Nielsen <> wrote:

> I never bought that argument. You can be DoS'ed in many, many ways. The
> solution is exponential backoff and similar, not to (again) compromise on
> the security of the password digests.

Exponential backoff based on what, source IP address? What if you're being

Account name? If you don't compute a password hash even for invalid account
names, you're vulnerable to user enumeration attacks.

Tony Arcieri

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