Date: Fri, 25 Jun 1999 15:03:03 -0400 (EDT) From: Robert Watson <robert@cyrus.watson.org> To: Jason Young <doogie@anet-stl.com> Cc: cjclark@home.com, freebsd-security@FreeBSD.ORG Subject: Re: Secure Deletion Message-ID: <Pine.BSF.3.96.990625145942.19134A-100000@fledge.watson.org> In-Reply-To: <Pine.BSF.3.96.990625002238.25811C-100000@earth.anet-stl.com>
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On a related noted, Ross Anderson and others wrote a paper on steganographic file systems http://www.ftp.cl.cam.ac.uk/ftp/users/rja14/sfs3.ps.gz That is, file systems intended to hide even the presence of files if the user is not authorized, cryptographically. Ross has suggested I port the linux code to FreeBSD while I'm at Cambridge for the next few weeks. Given the backlog of Posix.1e stuff, I may not get around to it, but it's an interesting concept. It does bring up the issue of meta-data, however. Probably, disk sectors should be marked as needing real wiping, and inodes + directory entries need to be similarly treated after file deletion. (this in FreeBSD-land again, not the SFS). Robert N M Watson robert@fledge.watson.org http://www.watson.org/~robert/ PGP key fingerprint: AF B5 5F FF A6 4A 79 37 ED 5F 55 E9 58 04 6A B1 Carnegie Mellon University http://www.cmu.edu/ TIS Labs at Network Associates, Inc. http://www.tis.com/ Safeport Network Services http://www.safeport.com/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-security" in the body of the message
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