From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Emanuel Berg via Users list for the GNU Emacs text editor Newsgroups: gmane.emacs.help Subject: Re: Noob dumb question (extending emacs) Date: Fri, 29 Oct 2021 00:54:04 +0200 Message-ID: <87fsskzroz.fsf@zoho.eu> References: <86k0i6uoxd.fsf@duenenhof-wilhelm.de> <871r4ernmt.fsf@zoho.eu> <87o87hnrpt.fsf@zoho.eu> <87y26kkuag.fsf@web.de> <87zgr0t3vw.fsf@web.de> <87o87fy4t3.fsf@zoho.eu> <87ilxmsuqq.fsf@web.de> <87k0hxj37u.fsf@zoho.eu> <878rydbcm4.fsf@web.de> <8735okj2bx.fsf@zoho.eu> Reply-To: Emanuel Berg Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="27719"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (gnu/linux) To: help-gnu-emacs@gnu.org Cancel-Lock: sha1:Kq9r7ErVTpQjAIhTdjNXXpsdI3Y= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Fri Oct 29 00:55:01 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 1mgEIX-0006y7-5A for geh-help-gnu-emacs@m.gmane-mx.org; Fri, 29 Oct 2021 00:55:01 +0200 Original-Received: from localhost ([::1]:36984 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mgEIV-0002kk-Ba for geh-help-gnu-emacs@m.gmane-mx.org; Thu, 28 Oct 2021 18:54:59 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:54198) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mgEHp-0002kU-T1 for help-gnu-emacs@gnu.org; Thu, 28 Oct 2021 18:54:18 -0400 Original-Received: from ciao.gmane.io ([116.202.254.214]:51816) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mgEHn-0000td-QX for help-gnu-emacs@gnu.org; Thu, 28 Oct 2021 18:54:17 -0400 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1mgEHl-000618-7T for help-gnu-emacs@gnu.org; Fri, 29 Oct 2021 00:54:13 +0200 X-Injected-Via-Gmane: http://gmane.org/ Mail-Followup-To: help-gnu-emacs@gnu.org Mail-Copies-To: never Received-SPF: pass client-ip=116.202.254.214; envelope-from=geh-help-gnu-emacs@m.gmane-mx.org; helo=ciao.gmane.io X-Spam_score_int: 2 X-Spam_score: 0.2 X-Spam_bar: / X-Spam_report: (0.2 / 5.0 requ) HEADER_FROM_DIFFERENT_DOMAINS=0.25, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no 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:134265 Archived-At: See below, if we remain at 48 bits of entropy, but instead of 60 have an alphabet of only 3 chars, the password length rises from 8.13 chars to 30.28 ... Does this tell us that it is equally difficult to randomly guess the both passwords from the two different configuration at these lengths, or what does it tell us? What does "48 bits of entropy" mean BTW? ;;; 48 bits, alphabet length n, password length l ;;; 2^48 = n^l <=> ;;; 48*ln(2) = l*ln(n) <=> ;;; l = 48*ln(2)/ln(n) (defun epwgen-password-length (bits abc) (let ((abc-len (if (numberp abc) abc (when (listp abc) (length abc) )))) (when abc-len (/ (* bits (log 2)) (log abc-len)) ))) ;; (epwgen-password-length 48 60) ; 8.13 ;; (epwgen-password-length 48 '(a b c)) ; 30.28 -- underground experts united https://dataswamp.org/~incal