Date: Mon, 7 Mar 2005 14:44:49 -0500 (EST) From: Garrett Wollman <wollman@khavrinen.lcs.mit.edu> To: Mark Murray <markm@FreeBSD.ORG> Cc: freebsd-security@FreeBSD.ORG Subject: Re: New entropy source proposal. Message-ID: <200503071944.j27JiniV006061@khavrinen.lcs.mit.edu> In-Reply-To: <200503071609.j27G9mR1032489@grovel.grondar.org> References: <20050307130330.GX9291@darkness.comp.waw.pl> <200503071609.j27G9mR1032489@grovel.grondar.org>
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<<On Mon, 07 Mar 2005 16:09:48 +0000, Mark Murray <markm@FreeBSD.ORG> said: > Did you have a noise source connected? I generated 1MB of data and it was not > very random at all. "hexdump -C data" showed the data was very poor indeed. The usual noise source is thermal noise in the machine itself. The process that I've heard described involves: 0) Disconnecting any input sources. 1) Turning the input gain all the way up. 2) Taking only the least-significant bit of each sample. In order to use this in FreeBSD, we would probably want a compile option in the sound drivers to disable their use for other purposes (e.g., generating sound). -GAWollman
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