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Date: Thu, 15 Dec 2016 15:57:46 +0800
From: Herbert Xu <>
To: "Jason A. Donenfeld" <>
Subject: Re: [PATCH v2 1/4] siphash: add cryptographically secure hashtable

Jason A. Donenfeld <> wrote:
> Siphash needs a random secret key, yes. The point is that the hash
> function remains secure so long as the secret key is kept secret.
> Other functions can't make the same guarantee, and so nervous periodic
> key rotation is necessary, but in most cases nothing is done, and so
> things just leak over time.

Actually those users that use rhashtable now have a much more
sophisticated defence against these attacks, dyanmic rehashing
when bucket length exceeds a preset limit.

Email: Herbert Xu <>
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