From owner-freebsd-security@FreeBSD.ORG Tue Sep 11 23:09:41 2012 Return-Path: Delivered-To: freebsd-security@freebsd.org Received: by hub.freebsd.org (Postfix, from userid 664) id 2685F106566C; Tue, 11 Sep 2012 23:09:41 +0000 (UTC) Date: Tue, 11 Sep 2012 16:09:40 -0700 From: David O'Brien To: d@delphij.net Message-ID: <20120911230940.GA90404@dragon.NUXI.org> References: <86sjao7q8c.fsf@ds4.des.no> <20120911205302.27484fd6@gumby.homeunix.com> <20120911200925.GA88456@dragon.NUXI.org> <504FA76A.5000209@delphij.net> <20120911211730.GB89188@dragon.NUXI.org> <504FAB87.3020701@delphij.net> <20120911215212.GA89515@dragon.NUXI.org> <504FBD15.8040907@delphij.net> <20120911224855.GE14077@x96.org> <504FC2BD.6070402@delphij.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <504FC2BD.6070402@delphij.net> X-Operating-System: FreeBSD 10.0-CURRENT X-to-the-FBI-CIA-and-NSA: HI! HOW YA DOIN? can i haz chizburger? User-Agent: Mutt/1.5.20 (2009-06-14) Cc: Arthur Mesh , Doug Barton , freebsd-rc@freebsd.org, freebsd-security@freebsd.org, RW , Dag-Erling ??? Subject: Re: svn commit: r239569 - head/etc/rc.d X-BeenThere: freebsd-security@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: obrien@freebsd.org List-Id: "Security issues \[members-only posting\]" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 11 Sep 2012 23:09:41 -0000 On Tue, Sep 11, 2012 at 04:01:17PM -0700, Xin Li wrote: > Situation 1: we have 45K of plain text, and only first 4k is fed to > /dev/random at about 5 bits of entropy per byte; > > Situation 2: we have 45K of plain text, compress to e.g. 25K and only > first 4k is fed to /dev/random at more than 7.6 bits of entropy per byte; Where do these bits of entropy per byte values come from? Their rather high. FYI, the Yarrow design limits the seed entropy density to a 0.5 multiplier. -- -- David (obrien@FreeBSD.org)