netdev - Re: [PATCH v2 1/4] siphash: add cryptographically secure hashtable function

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Thu, 15 Dec 2016 15:57:46 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     "Jason A. Donenfeld" <Jason@...c4.com>
Cc:     hannes@...essinduktion.org, netdev@...r.kernel.org,
        kernel-hardening@...ts.openwall.com, linux-kernel@...r.kernel.org,
        linux-crypto@...r.kernel.org, jeanphilippe.aumasson@...il.com,
        djb@...yp.to, torvalds@...ux-foundation.org, ebiggers3@...il.com
Subject: Re: [PATCH v2 1/4] siphash: add cryptographically secure hashtable
 function

Jason A. Donenfeld <Jason@...c4.com> 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.

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt