From owner-freebsd-current Fri Sep 1 19:50:22 2000 Delivered-To: freebsd-current@freebsd.org Received: from whizzo.transsys.com (whizzo.TransSys.COM [144.202.42.10]) by hub.freebsd.org (Postfix) with ESMTP id A17A237B42C; Fri, 1 Sep 2000 19:50:20 -0700 (PDT) Received: from whizzo.transsys.com (localhost.transsys.com [127.0.0.1]) by whizzo.transsys.com (8.11.0/8.11.0) with ESMTP id e822o2G01287; Fri, 1 Sep 2000 22:50:04 -0400 (EDT) (envelope-from louie@whizzo.transsys.com) Message-Id: <200009020250.e822o2G01287@whizzo.transsys.com> X-Mailer: exmh version 2.1.1 10/15/1999 To: Mark Murray Cc: Kris Kennaway , Adam Back , current@FreeBSD.ORG, jeroen@vangelderen.org, yarrow@zeroknowledge.com X-Image-URL: http://www.transsys.com/louie/images/louie-mail.jpg From: "Louis A. Mamakos" Subject: Re: yarrow & /dev/random References: <200009012023.e81KNqx07894@grimreaper.grondar.za> In-reply-to: Your message of "Fri, 01 Sep 2000 22:23:52 +0200." <200009012023.e81KNqx07894@grimreaper.grondar.za> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Fri, 01 Sep 2000 22:50:02 -0400 Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG > > I posted code and results a while back to freebsd-arch which sampled the > > sound card from userland and analysed the shannon entropy of the noise > > (for the record, all but one card I tried gave about 6 bits of entropy or > > more per 16 bit sample with no recording device plugged in, and maximum > > input gain, and could be sampled 44000 times per second or more. The other > > card driver was probably broken). Thats what I'm basing this on, but I > > haven't tried to make a kernel harvester. > > Ok! Have you still got that code? Please either send it to me (personally) > or send a reference. Some ideas about how to use [this type of source] > in FreeBSD are also usefulp; It's easy to "steal" a sound card; to use a > sound card as an entropy source is more of a problem; ideas welcome. Yes, and I'd like to run the code over some more video frames captured from the Bt848-based board. When tuned to an empty channel, there would seem to be much noise to be had.. louie To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message