From owner-freebsd-fs@FreeBSD.ORG Sat Aug 14 05:01:56 2004 Return-Path: Delivered-To: freebsd-fs@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 31B3916A4CE; Sat, 14 Aug 2004 05:01:56 +0000 (GMT) Received: from maui.ebi.ac.uk (maui.ebi.ac.uk [193.62.196.100]) by mx1.FreeBSD.org (Postfix) with ESMTP id 4BD9643D31; Sat, 14 Aug 2004 05:01:55 +0000 (GMT) (envelope-from kreil@ebi.ac.uk) Received: from puffin.ebi.ac.uk (puffin.ebi.ac.uk [193.62.196.89]) by maui.ebi.ac.uk (8.11.7+Sun/8.11.7) with ESMTP id i7E51qF22854; Sat, 14 Aug 2004 06:01:52 +0100 (BST) Received: from puffin.ebi.ac.uk (kreil@localhost) by puffin.ebi.ac.uk (8.11.6/8.11.6) with ESMTP id i7E51qi03762; Sat, 14 Aug 2004 06:01:52 +0100 Message-Id: <200408140501.i7E51qi03762@puffin.ebi.ac.uk> X-Mailer: exmh version 2.4 06/23/2000 with nmh-1.0.4 To: David Kreil , freebsd-fs@freebsd.org, freebsd-questions@freebsd.org In-Reply-To: Your message of "Tue, 20 Jul 2004 07:16:37 EDT." <20040720111637.GJ12833@afields.ca> X-Habeas-SWE-1: winter into spring X-Habeas-SWE-2: brightly anticipated X-Habeas-SWE-3: like Habeas SWE (tm) X-Habeas-SWE-4: Copyright 2002 Habeas (tm) X-Habeas-SWE-5: Sender Warranted Email (SWE) (tm). The sender of this X-Habeas-SWE-6: email in exchange for a license for this Habeas X-Habeas-SWE-7: warrant mark warrants that this is a Habeas Compliant X-Habeas-SWE-8: Message (HCM) and not spam. Please report use of this X-Habeas-SWE-9: mark in spam to . Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Sat, 14 Aug 2004 06:01:52 +0100 From: David Kreil X-EBI-Information: This email is scanned using www.mailscanner.info. X-EBI: Found to be clean X-EBI-SpamCheck: not spam, SpamAssassin (score=-8, required 5, HABEAS_SWE -8.00) Subject: Re: gbde blackening feature - how are the keys "destroyed"? X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 14 Aug 2004 05:01:56 -0000 Hello, I was wondering whether someone knowledgable about gbde internals could tell me how the keys are being destroyed on request under the "blackening feature". Ideally, I'd like them to be overwritten with random data at least 20 times independently, but I suspect it may well be done in a different way. I'd be grateful for learning how the blackening works (and why!). With many thanks for your help in advance, David Kreil. ------------------------------------------------------------------------ Dr David Philip Kreil ("`-''-/").___..--''"`-._ Research Fellow `6_ 6 ) `-. ( ).`-.__.`) University of Cambridge (_Y_.)' ._ ) `._ `. ``-..-' ++44 1223 764107, fax 333992 _..`--'_..-_/ /--'_.' ,' www.inference.phy.cam.ac.uk/dpk20 (il),-'' (li),' ((!.-'