From owner-freebsd-security@FreeBSD.ORG Tue Sep 25 09:36:33 2012 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 15DDD106564A; Tue, 25 Sep 2012 09:36:33 +0000 (UTC) (envelope-from mariusz.gromada@gmail.com) Received: from mail-qa0-f54.google.com (mail-qa0-f54.google.com [209.85.216.54]) by mx1.freebsd.org (Postfix) with ESMTP id 764398FC14; Tue, 25 Sep 2012 09:36:32 +0000 (UTC) Received: by qady23 with SMTP id y23so3986442qad.13 for ; Tue, 25 Sep 2012 02:36:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; bh=iKQf+LZ+EwAygXnAy3+lHYd4MI79hZkd1TdxrEYwbq4=; b=hU35xHBfTJjP4mPC2s6H//7ewJW4Ww+Gg4eTILq17z2kooEAqkeZ2JO9NeyWGhdAQI lsAbsbdmVRTbzAk9FOZiuTdV/QThOFqy2xI70ioj9sClJ4oWEmAD3N8RUwQw06kYLoet ygmTwNSXJUgkVO9QT7m9PFcrfzaQpqnSc+zaNSMVYqkiVXFQPYC8zFCXuZUmVNQ1PtN4 aMDjRhsq+tM37qXbJaybx/IPFSptsqR+9EK1Xz5uOA/o1Y6U6Svy3Q+5l4q5jKftzXdj sjZRrNj4qM601svFmQFpYZPZqfUImCkkwIEx6J1pzxXcZfoniLpw3UsjlTAbMUIfN4MU PDwA== MIME-Version: 1.0 Received: by 10.229.252.196 with SMTP id mx4mr9931489qcb.16.1348565791758; Tue, 25 Sep 2012 02:36:31 -0700 (PDT) Received: by 10.49.81.242 with HTTP; Tue, 25 Sep 2012 02:36:31 -0700 (PDT) In-Reply-To: References: <20120918211422.GA1400@garage.freebsd.pl> <20120919231051.4bc5335b@gumby.homeunix.com> <20120920102104.GA1397@garage.freebsd.pl> <201209200758.51924.jhb@freebsd.org> <20120922080323.GA1454@garage.freebsd.pl> <20120922195325.GH1454@garage.freebsd.pl> <505E59DC.7090505@gmail.com> <20120923151706.GN1454@garage.freebsd.pl> <5060D723.6020305@gmail.com> Date: Tue, 25 Sep 2012 11:36:31 +0200 Message-ID: From: Mariusz Gromada To: Ben Laurie X-Mailman-Approved-At: Tue, 25 Sep 2012 11:55:15 +0000 Content-Type: text/plain; charset=ISO-8859-1 X-Content-Filtered-By: Mailman/MimeDel 2.1.5 Cc: freebsd-security@freebsd.org, RW , Jonathan Anderson , Pawel Jakub Dawidek , John Baldwin Subject: Re: Collecting entropy from device_attach() times. 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: Tue, 25 Sep 2012 09:36:33 -0000 2012/9/25 Mariusz Gromada > > Empirically, it seems to me that these numbers are actually unlikely >> to be correlated with each other, but that has not been tested. >> > > > Another yes, you are right. We need much more data to check if we have a > stochastic process consisted of independent random variables. > > Here we did some initial testing, mainly based on charts, which showed typical noise in time. But again, it requires a formal proof.