Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Sat, 28 Dec 2002 15:20:23 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Sat, 28 Dec 2002 15:20:23 -0500 Received: from keetweej.xs4all.nl ([213.84.46.114]:128 "EHLO muur.intranet.vanheusden.com") by vger.kernel.org with ESMTP id ; Sat, 28 Dec 2002 15:20:19 -0500 From: "Folkert van Heusden" To: "'John Bradford'" , "'Stephen Satchell'" Cc: Subject: RE: Want a random entropy source? Date: Sat, 28 Dec 2002 21:28:24 +0100 Message-ID: <003c01c2aeaf$ac673530$3640a8c0@boemboem> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook CWS, Build 9.0.2416 (9.0.2910.0) Importance: Normal In-Reply-To: <200212281600.gBSG0P4r001160@darkstar.example.net> X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 895 Lines: 19 > I was astonished to see that the resulting signal is a white-noise > pattern with a slight emphasis at the high end (when sampled at 44 > kilosamples per second). In short, it looks like diode noise with a > 4 kilohertz square wave thrown in. > "That suggests to me that this would make a fair source of random samples, > especially after you slot out the interfering signal. JB> How can you guarantee that you are sampling noise, though, what if a JB> sound card was picking up 50 Hz mains hum, for example, that would JB> de-randomise the data quite a bit. Well, the 50hz from the mains isn't a perfect 50hz; it has random (yes) fluctuations. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/