Date: Mon, 7 Mar 2005 14:17:32 +0100 From: Pawel Jakub Dawidek <pjd@FreeBSD.org> To: Poul-Henning Kamp <phk@phk.freebsd.dk> Cc: freebsd-security@freebsd.org Subject: Re: New entropy source proposal. Message-ID: <20050307131732.GY9291@darkness.comp.waw.pl> In-Reply-To: <16931.1110200831@critter.freebsd.dk> References: <20050307130330.GX9291@darkness.comp.waw.pl> <16931.1110200831@critter.freebsd.dk>
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--VrJw22pJ2/Vk+GaX Content-Type: text/plain; charset=iso-8859-2 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Mon, Mar 07, 2005 at 02:07:11PM +0100, Poul-Henning Kamp wrote: +> In message <20050307130330.GX9291@darkness.comp.waw.pl>, Pawel Jakub Daw= idek wr +> ites: +>=20 +> >I've been playing a bit with "use sound card as an entropy source" idea. +> >This simple program does what I wanted: +>=20 +> Can you give a quick summary: +>=20 +> What sample setting do you use ? +>=20 +> What gain setting do you use ? +>=20 +> Have you run experiements where you have attached various +> signal sources to the input ? Music ? Pure sine tone ? I didn't make any sound card configuration nor connected sound source. It was just pure noice (no microphone attached). /dev/dspW uses 16-bit little endian encoding and I only use less significant 8 bits. As I read "Open Sound System" guide, on sound device open it works in 8kHz mono mode. So that was my testing environment. I'm not an expert in this area, of course, just playing around and giving a start for future research, I hope. --=20 Pawel Jakub Dawidek http://www.wheel.pl pjd@FreeBSD.org http://www.FreeBSD.org FreeBSD committer Am I Evil? Yes, I Am! --VrJw22pJ2/Vk+GaX Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (FreeBSD) iD8DBQFCLFRsForvXbEpPzQRAgicAJ404FWCCOKN4q210G3OmfMi+X15mwCgktlf tPuT9fuX00PK/VnP/1TVvZM= =fc9f -----END PGP SIGNATURE----- --VrJw22pJ2/Vk+GaX--
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