From owner-freebsd-security@FreeBSD.ORG Thu Jan 28 22:40:26 2010 Return-Path: Delivered-To: freebsd-security@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 881CA106568F for ; Thu, 28 Jan 2010 22:40:26 +0000 (UTC) (envelope-from rwmaillists@googlemail.com) Received: from fg-out-1718.google.com (fg-out-1718.google.com [72.14.220.157]) by mx1.freebsd.org (Postfix) with ESMTP id 187678FC26 for ; Thu, 28 Jan 2010 22:40:25 +0000 (UTC) Received: by fg-out-1718.google.com with SMTP id l26so115727fgb.13 for ; Thu, 28 Jan 2010 14:40:25 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=googlemail.com; s=gamma; h=domainkey-signature:received:received:date:from:to:subject :message-id:in-reply-to:references:x-mailer:mime-version :content-type:content-transfer-encoding; bh=eD5hnHBxxGxviZALFD9jswgw5wOKu/nRIwBADkwDBIs=; b=oR9KmkH3hv2R4m5qBQVKT34tSghrRDNEVzWCLu3/GMxSWKT/niPuzVJXV863R/9CTk 4jWnK9XWN4iuTHl0mLrXjL6MtiF9TYc0thFzTgZm4Kl8AGchuiCvYmQyVwDC/1hKwMjH yCi/3T2BbrpLWb96NfdeQD4XffKdhUCqKkd3M= DomainKey-Signature: a=rsa-sha1; c=nofws; d=googlemail.com; s=gamma; h=date:from:to:subject:message-id:in-reply-to:references:x-mailer :mime-version:content-type:content-transfer-encoding; b=sbIpZGyeUXUmvmBoANyf3SG1Rbv68HbASeKGZqSwxxJX3CkWUQTufbYKD37B0XodbL q3u0ZNX1VmZ2ZvPR/F0XMaUFXVxYG25cKNHD3SB0C0dGfL9g8buZ6vn04SdA+j/2nR1d BoLz6Xb6LA0TLusqQ7SZu1zT/qL80UsQVSaLA= Received: by 10.87.67.24 with SMTP id u24mr682860fgk.21.1264718424922; Thu, 28 Jan 2010 14:40:24 -0800 (PST) Received: from gumby.homeunix.com (bb-87-81-140-128.ukonline.co.uk [87.81.140.128]) by mx.google.com with ESMTPS id e11sm3004655fga.8.2010.01.28.14.40.23 (version=SSLv3 cipher=RC4-MD5); Thu, 28 Jan 2010 14:40:24 -0800 (PST) Date: Thu, 28 Jan 2010 22:40:22 +0000 From: RW To: freebsd-security@freebsd.org Message-ID: <20100128224022.396588dc@gumby.homeunix.com> In-Reply-To: <9d972bed1001281324r29b4b93bw9ec5bc522d0e2764@mail.gmail.com> References: <20100128182413.GI892@noncombatant.org> <9d972bed1001281324r29b4b93bw9ec5bc522d0e2764@mail.gmail.com> X-Mailer: Claws Mail 3.7.4 (GTK+ 2.18.6; i386-portbld-freebsd8.0) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Subject: Re: PHK's MD5 might not be slow enough anymore X-BeenThere: freebsd-security@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: "Security issues \[members-only posting\]" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 28 Jan 2010 22:40:26 -0000 On Thu, 28 Jan 2010 16:24:43 -0500 Roger wrote: > What would be the consequence of having an algorithm that will > increase the amount of time needed to check the next password after a > failure. The point of slowing down the algorithm is to protect against off-line attack where an attacker has gained access to a copy of master.passwd. Any hashing has to be done when the password is set, so it's fixed thereafter.