Date: Mon, 05 Apr 2004 20:38:14 +0200 From: "Poul-Henning Kamp" <phk@phk.freebsd.dk> To: John-Mark Gurney <gurney_j@efn.org> Cc: freebsd-geom@freebsd.org Subject: Re: how ro recover encrypted slice Message-ID: <3550.1081190294@critter.freebsd.dk> In-Reply-To: Your message of "Mon, 05 Apr 2004 11:28:52 PDT." <20040405182852.GC567@funkthat.com>
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In message <20040405182852.GC567@funkthat.com>, John-Mark Gurney writes: >Poul-Henning Kamp wrote this message on Mon, Apr 05, 2004 at 09:21 +0200: >> In message <c3421fc3355c.c3355cc3421f@nyroc.rr.com>, mmarkows@twcny.rr.com writ >> es: >> >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. > >Doesn't this mean he can restore from his 3 week old backup of >/etc/gbde/ad1s2, and then get back to bussiness? I assume that his >backup covered /etc... and that /etc/gbde/ad1s2 doesn't change over >time... Provided you have not changed the password on your GBDE partition in the meantime: yes, you can do that. -- 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.
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