From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Jean Louis Newsgroups: gmane.emacs.help Subject: Re: Noob dumb question (extending emacs) Date: Sun, 24 Oct 2021 09:45:43 +0300 Message-ID: References: <86k0i6uoxd.fsf@duenenhof-wilhelm.de> <871r4ernmt.fsf@zoho.eu> <87o87hnrpt.fsf@zoho.eu> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="40728"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Mutt/2.0.7+183 (3d24855) (2021-05-28) Cc: help-gnu-emacs , Emanuel Berg To: Yuri Khan Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Sun Oct 24 08:51:12 2021 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1meXLb-000AIa-Bs for geh-help-gnu-emacs@m.gmane-mx.org; Sun, 24 Oct 2021 08:51:11 +0200 Original-Received: from localhost ([::1]:54852 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1meXLa-0004gp-2V for geh-help-gnu-emacs@m.gmane-mx.org; Sun, 24 Oct 2021 02:51:10 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:57480) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1meXLE-0004gd-OV for help-gnu-emacs@gnu.org; Sun, 24 Oct 2021 02:50:48 -0400 Original-Received: from stw1.rcdrun.com ([217.170.207.13]:44181) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1meXLB-0002FG-BN for help-gnu-emacs@gnu.org; Sun, 24 Oct 2021 02:50:47 -0400 Original-Received: from localhost ([::ffff:41.75.191.219]) (AUTH: PLAIN admin, TLS: TLS1.3,256bits,ECDHE_RSA_AES_256_GCM_SHA384) by stw1.rcdrun.com with ESMTPSA id 0000000000065D91.0000000061750242.00000CBE; Sat, 23 Oct 2021 23:50:42 -0700 Mail-Followup-To: Yuri Khan , Emanuel Berg , help-gnu-emacs Content-Disposition: inline In-Reply-To: Received-SPF: pass client-ip=217.170.207.13; envelope-from=bugs@gnu.support; helo=stw1.rcdrun.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: "help-gnu-emacs" Xref: news.gmane.io gmane.emacs.help:134086 Archived-At: * Yuri Khan [2021-10-23 13:47]: > On Sat, 23 Oct 2021 at 04:35, Jean Louis wrote: > > > - I have noticed that file "/proc/pressure/io" is constantly > > changing, could not find temperature stuff now, thus: > > “Constantly changing” does not mean it is a reliable source of > randomness (entropy). > > Also, the word “pressure” there does not refer to any physical > processes. In context, it is a metaphor, referring to the concurrent > processes in your computer competing for a resource, in this case, the > input/output system. > > Anyway: > > $ cat /proc/pressure/io > some avg10=0.00 avg60=0.00 avg300=0.05 total=313213969 > full avg10=0.00 avg60=0.00 avg300=0.04 total=238002455 > > $ cat /proc/pressure/io > some avg10=0.13 avg60=1.09 avg300=1.08 total=318142202 > full avg10=0.13 avg60=0.98 avg300=0.97 total=242407828 > > What we have here is some constant text that does not contribute to > randomness in any way, and a few decimal numbers. A single sampling > gives you 36 digits. 3 decimal digits ≈ 10 bits, so you could estimate > 120 bits which would be considered a fair amount of entropy. Congratulation for the analysis, although myself I cannot follow it. > (Of course you could just replicate what pwgen does, and read from > /dev/urandom or /dev/random, and directly convert that into characters > usable in passwords.) I agree, though I don't need it personally, as no analyst so far has cracked any of my Emacs Lisp generated passwords. I will give US $1,000 if you crack any of my passwords in any of websites I am subscribed within next 2 years. OK? -- Jean Take action in Free Software Foundation campaigns: https://www.fsf.org/campaigns In support of Richard M. Stallman https://stallmansupport.org/