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Date:	Tue, 20 Feb 2007 07:49:11 -0800
From:	"Michael K. Edwards" <>
To:	"Evgeniy Polyakov" <>
Cc:	"David Miller" <>,,,,,
Subject: Re: Extensible hashing and RCU

On 2/20/07, Evgeniy Polyakov <> wrote:
> Jenkins _does_ have them, I showed tests half a year ago and in this
> thread too. Actually _any_ hash has them it is just a matter of time
> to find one.

I think you misunderstood me.  If you are trying to DoS me from
outside with a hash collision attack, you are trying to feed me
packets that fall into the same hash bucket.  The Jenkins hash does
not have to be artifact-free, and does not have to be
cryptographically strong.  It just has to do a passable job of mixing
a random salt into the tuple, so you don't know which string of
packets to feed me in order to fill one (or a few) of my buckets.
XORing salt into a folded tuple doesn't help; it just permutes the

- Michael
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