Date: Fri, 04 Mar 2005 00:18:40 +0100 From: "Poul-Henning Kamp" <phk@phk.freebsd.dk> To: Roland Dowdeswell <elric@imrryr.org> Cc: ticso@cicely.de Subject: Re: FUD about CGD and GBDE Message-ID: <12182.1109891920@critter.freebsd.dk> In-Reply-To: Your message of "Thu, 03 Mar 2005 17:58:49 EST." <20050303225849.0E7143700F@arioch.imrryr.org>
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In message <20050303225849.0E7143700F@arioch.imrryr.org>, Roland Dowdeswell writes: >Now, the key--key sector protects 32 disk >sectors which contain 32 * 512 * 8 = 131072 bits. The key-key protect only a single sector-key, however, the actual sectorsize may be bigger than 512 and I recommend that people use the FFS fragment size (typically 2k) if possible. I have not taken the time to figure out how many of the 2^2048 possible sector contents are actually valid superblocks but it would actually be an interesting number to know in this dicussion, just like the fraction of valid inode blocks and directory blocks would be interesting to know. My guess is that the super block probability is about 1E-9, inode block around 1E-8 and directory around 1E-9, but these are pure guesses and likely off by a many orders of magnitude. The bsd disklabel is not relevant in normal usage, people tend to encrypt each filesystem individually as far as I have heard. But Roland, These continued false starts because you didn't take the time to really understand what goes on in GBDE are a waste of both your and my time and doesn't add to your reputation in any way. I am old enough to actually appreciate a competently done review because that is one of the best ways for me to improve my skills, so even if your review ends up tearing GBDE apart at the seams, you can trust me to appreciate that you did it. And I am convinced you can give me a competent review if you give it a fair shot, but right now you seem hell-bent on acing me rather than doing your homework properly. Please sit down and take the time it must take and then come back with a professionally done review. If there are things you are unclear about, send me email and I'll do my best to explain them. Thanks in advance, Poul-Henning -- 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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