From owner-freebsd-geom@FreeBSD.ORG Mon Apr 5 00:21:23 2004 Return-Path: Delivered-To: freebsd-geom@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id B68FE16A4CE for ; Mon, 5 Apr 2004 00:21:23 -0700 (PDT) Received: from critter.freebsd.dk (0x50a171c6.naenxx7.adsl-dhcp.tele.dk [80.161.113.198]) by mx1.FreeBSD.org (Postfix) with ESMTP id 7496C43D39 for ; Mon, 5 Apr 2004 00:21:22 -0700 (PDT) (envelope-from phk@phk.freebsd.dk) Received: from critter.freebsd.dk (localhost [127.0.0.1]) by critter.freebsd.dk (8.12.11/8.12.11) with ESMTP id i357LJM9001789; Mon, 5 Apr 2004 09:21:19 +0200 (CEST) (envelope-from phk@phk.freebsd.dk) To: mmarkows@twcny.rr.com From: "Poul-Henning Kamp" In-Reply-To: Your message of "Sun, 04 Apr 2004 18:42:33 EDT." Date: Mon, 05 Apr 2004 09:21:19 +0200 Message-ID: <1788.1081149679@critter.freebsd.dk> cc: freebsd-geom@freebsd.org Subject: Re: how ro recover encrypted slice X-BeenThere: freebsd-geom@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: GEOM-specific discussions and implementations List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 05 Apr 2004 07:21:23 -0000 In message , mmarkows@twcny.rr.com writ es: >Hi, > >I mounted a GEOM-encrypted slice to /home2 and stored all my data there. Two days ago, I decided to update my FreeBSD from 5.2 to 5.2.1. I have done it several times before, so I felt self-assured. I backed up my config files, forgetting unfortunately about /etc/gbde/ad1s2. > >During the update procedure my system was messed up to the extent that it seemed reasonable to do a clean install of 5.2.1. I did it without saving /etc/gbde/ad1s2, and without touching the encrypted slice. > >Now, I am in a predicament because I cannot access my files that I need for my work tomorrow. I know that I messed up, but my last backup is 3 weeks old, and essentially it is no good any more. > >Is there any way to recover the data? I have 13 hours to do it. The data stored in the file you lost is only the encrypted location of the master key, so in theory you could do a brute force search for the master key. Unless your encrypted partition is of rather trivial size, this will take a lot of time. You will need to adapt the code from gbde(8) to do this, but that should be rather straight forward: simply try every single byte offset on the disk. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence.