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Date: Fri, 16 Dec 2016 11:47:35 -0800
From: Tom Herbert <>
To: "Jason A. Donenfeld" <>
Cc: Jean-Philippe Aumasson <>, 
	George Spelvin <>, Andi Kleen <>, 
	David Miller <>, David Laight <>, 
	Eric Biggers <>, Hannes Frederic Sowa <>,, 
	Linux Crypto Mailing List <>, LKML <>, 
	Andy Lutomirski <>, Netdev <>, 
	Linus Torvalds <>, "Theodore Ts'o" <>,, 
	"Daniel J . Bernstein" <>
Subject: Re: [PATCH v5 1/4] siphash: add cryptographically secure PRF

On Fri, Dec 16, 2016 at 4:39 AM, Jason A. Donenfeld <> wrote:
> Hey JP,
> On Fri, Dec 16, 2016 at 9:08 AM, Jean-Philippe Aumasson
> <> wrote:
>> Here's a tentative HalfSipHash:
>> Haven't computed the cycle count nor measured its speed.
Tested this. Distribution and avalanche effect are still good. Speed
wise I see about a 33% improvement over siphash (20 nsecs/op versus 32
nsecs). That's about 3x of jhash speed (7 nsecs). So that might closer
to a more palatable replacement for jhash. Do we lose any security
advantages with halfsiphash?


> This is incredible. Really. Wow!
> I'll integrate this into my patchset and will write up some
> documentation about when one should be used over the other.
> Thanks again. Quite exciting.
> Jason

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