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Date: Tue, 14 Jan 2014 23:20:28 -0800
From: Andy Lutomirski <>
To: discussions <>
Subject: Re: [PHC] A must read...

On Jan 14, 2014 11:14 PM, "Solar Designer" <> wrote:
> On Tue, Jan 14, 2014 at 09:20:16PM -0500, Bill Cox wrote:
> > On Tue, Jan 14, 2014 at 5:31 PM, Andy Lutomirski <>
> > > On Tue, Jan 14, 2014 at 2:28 PM, Bill Cox > Out of curiosity, have
you tried MultHash(hash, v[addr], prevV, v[addr
> > > - C]) where C is something like L2 cache size?  It might help to have
> > > even more taps.
> >
> > That's funny because my previous hash function was exactly that,
> > though C was 1.  It did help, and was the version that "passed" the
> > DieHarder tests.  I'd be curious to understand your feeling for why
> > that would work better.  I discovered it through trial and error.
> I guess Andy suggested this as an easy way to make some use of L2 cache
> for defense, not as a way to improve randomness.

Yes.  No idea how well it works on modern CPUs -- it probably depends
heavily on the cache replacement algorithm and how many loads can be

> Alexander

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