Date: Sun, 10 Jun 2012 18:55:18 +0200 (CEST) From: Damian Weber <dweber@htw-saarland.de> To: =?ISO-8859-1?Q?Dag-Erling_Sm=F8rgrav?= <des@des.no> Cc: freebsd-security@freebsd.org, Gleb Kurtsou <gleb.kurtsou@gmail.com>, "Simon L. B. Nielsen" <simon@freebsd.org> Subject: Re: Default password hash Message-ID: <alpine.BSF.2.00.1206101826300.2189@magritte.htw-saarland.de> In-Reply-To: <20120610145351.GA1098@reks> References: <86r4tqotjo.fsf@ds4.des.no> <6E26E03B-8D1D-44D3-B94E-0552BE5CA894@FreeBSD.org> <20120610145351.GA1098@reks>
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This message is in MIME format. The first part should be readable text, while the remaining parts are likely unreadable without MIME-aware tools. --2065465572-899095623-1339347323=:2189 Content-Type: TEXT/PLAIN; charset=ISO-8859-1 Content-Transfer-Encoding: 8BIT > On 8 Jun 2012, at 13:51, Dag-Erling Smørgrav wrote: > > > We still have MD5 as our default password hash, even though known-hash > > attacks against MD5 are relatively easy these days. *collision* attacks are relatively easy these days, but against 1 MD5, not against 1000 times MD5 w.r.t. password hashes, a successful preimage attack would be threatening, which publications are you referring to? I found one preimage attack on reduced MD5, but it's theoretical (2^96 steps) "Preimage Attacks on 3-Pass HAVAL and Step-Reduced MD5*" eprint.iacr.org/2008/183.pdf > > We've supported > > SHA256 and SHA512 for many years now, so how about making SHA512 the > > default instead of MD5, like on most Linux distributions? there is a NIST hash competition running, the winner will soon be announced (and it won't be SHA256 or SHA512 ;-) http://csrc.nist.gov/groups/ST/hash/timeline.html so my suggestion would be to use all of the finalists - especially the winner - for password hashing * BLAKE * Grøstl * JH * Keccak * Skein see, for example, http://www.nist.gov/itl/csd/sha3_010511.cfm -- Damian Weber, <http://www-crypto.htw-saarland.de>; --2065465572-899095623-1339347323=:2189--
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