From owner-freebsd-security Sun May 16 19:19:32 1999 Delivered-To: freebsd-security@freebsd.org Received: from weathership.homeport.org (breakwater.homeport.org [216.67.13.2]) by hub.freebsd.org (Postfix) with ESMTP id 6932315059 for ; Sun, 16 May 1999 19:19:24 -0700 (PDT) (envelope-from adam@weathership.homeport.org) Received: (from adam@localhost) by weathership.homeport.org (8.8.8/8.8.5) id WAA01918; Sun, 16 May 1999 22:33:23 -0400 (EDT) Date: Sun, 16 May 1999 22:33:23 -0400 From: Adam Shostack To: nr1@ihug.co.nz Cc: freebsd-security@FreeBSD.ORG Subject: Re: secure backup Message-ID: <19990516223322.B1851@weathership.homeport.org> References: <199905170014.MAA18766@smtp1.ihug.co.nz> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 0.95.3i In-Reply-To: <199905170014.MAA18766@smtp1.ihug.co.nz>; from nr1@ihug.co.nz on Mon, May 17, 1999 at 12:14:19PM +1200 Sender: owner-freebsd-security@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org You're worried about errors on the tape, I presume? You could pipe the output of pgp through something that does redundant encoding, such that errors on the tape are recoverable outside the tape. There are some direct tradeoffs that you can find between bloat and recoverability; as you add bits, your odds of being able to reconstruct increase. Adam On Mon, May 17, 1999 at 12:14:19PM +1200, nr1@ihug.co.nz wrote: | Can anyone recommend how I should go about creating a backup to an untrusted | machine that has the tape drive, and using an untrusted network. | | I'm a bit wary of encrypting the output of tar or dump, as a single byte error | would make the rest of the backup useless. I'd like to encrypt (pgp?) each | file separately as I go, so that a corrupted byte affects only one file on | retrieval. Is there an existing way to do this, or should I hack tar or dump | into doing it? -- "It is seldom that liberty of any kind is lost all at once." -Hume To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-security" in the body of the message