phc-discussions - Re: [PHC] Question about saturating the memory bandwidth

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Message-ID: <CA+aY-u5wisYQOYpP2Wkxh0r6cPAm=umViP=XAj3Rc=h9PsVhsA@mail.gmail.com>
Date: Sat, 18 Jan 2014 13:32:17 +0000
From: Peter Maxwell <peter@...icient.co.uk>
To: discussions@...sword-hashing.net
Subject: Re: [PHC] Question about saturating the memory bandwidth

On 18 January 2014 09:47, Solar Designer <solar@...nwall.com> wrote:

> On Sat, Jan 18, 2014 at 08:40:08AM +0000, Peter Maxwell wrote:
> > And therein lies the rub.  Saturating the memory bandwidth will not be
> > practical - or even nearly so - for the majority of use-cases.
>  Similarly,
> > the idea of the defender using GPUs will not be reasonable in most
> > instances either.  Yes, there are specific cases where it might be useful
> > but one needs to address far more mundane scenarios like busy web-servers
> > on current hardware.
>
> There's no problem with saturating the memory bandwidth for password
> hashing on busy web servers.
>
> 
Ok, what would you consider reasonable "general use" parameters for a busy
web-service hosted on reasonable hardware that meets your idea of a minimum
security threshold: how much memory do you intend to use, how much
computation time/cycles do you suggest?

(yes, I'm being cheeky, there is going to be a follow up)

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