[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: Default number of overwrites in shred
From: |
Pádraig Brady |
Subject: |
Re: Default number of overwrites in shred |
Date: |
Thu, 22 Jan 2009 13:14:45 +0000 |
User-agent: |
Thunderbird 2.0.0.6 (X11/20071008) |
Jim Meyering wrote:
> Sure.
> Too many people waste too much time with the existing defaults.
Pushing the attached soon so.
Note the recent paper suggesting a single pass is fine is:
http://sansforensics.wordpress.com/2009/01/15/overwriting-hard-drive-data/
However the methods there a questioned in the "Further Epilogue" here:
http://www.cs.auckland.ac.nz/~pgut001/pubs/secure_del.html
cheers,
Pádraig.
>From fdcda77f8cf05da18752e3c1e28ac59f819266b2 Mon Sep 17 00:00:00 2001
From: =?utf-8?q?P=C3=A1draig=20Brady?= <address@hidden>
Date: Thu, 22 Jan 2009 13:09:44 +0000
Subject: [PATCH] shred: change default number of overwrite from 25 to 3
* src/shred.c: Overwriting 3 times is sufficient
with current drive technologies.
* src/TODO: Reference Paul Eggert's suggestion
of enhancing shred to conform to DoD 5220 rules.
---
TODO | 3 +++
src/shred.c | 2 +-
2 files changed, 4 insertions(+), 1 deletions(-)
diff --git a/TODO b/TODO
index cc5b0b3..c630548 100644
--- a/TODO
+++ b/TODO
@@ -107,6 +107,9 @@ sort: Investigate better sorting algorithms; see Knuth vol.
3.
5.3.1, who credits Lester Ford, Jr. and Selmer Johnson, American
Mathematical Monthly 66 (1959), 387-389.
+shred: Update shred as described here to conform to DoD 5220 rules:
+http://lists.gnu.org/archive/html/bug-coreutils/2007-05/msg00075.html
+
Remove suspicious uses of alloca (ones that may allocate more than
about 4k)
diff --git a/src/shred.c b/src/shred.c
index 224f671..6ed4daa 100644
--- a/src/shred.c
+++ b/src/shred.c
@@ -102,7 +102,7 @@
#include "randread.h"
/* Default number of times to overwrite. */
-enum { DEFAULT_PASSES = 25 };
+enum { DEFAULT_PASSES = 3 };
/* How many seconds to wait before checking whether to output another
verbose output line. */
--
1.5.3.6
- Re: Default number of overwrites in shred, Pádraig Brady, 2009/01/22
- Re: Default number of overwrites in shred, Jim Meyering, 2009/01/22
- Re: Default number of overwrites in shred,
Pádraig Brady <=
- Re: Default number of overwrites in shred, HggdH, 2009/01/23
- Re: Default number of overwrites in shred, Pádraig Brady, 2009/01/25
- Re: Default number of overwrites in shred, HggdH, 2009/01/26
- Re: Default number of overwrites in shred, Pádraig Brady, 2009/01/26
- Re: Default number of overwrites in shred, Pádraig Brady, 2009/01/26
- Re: Default number of overwrites in shred, HggdH, 2009/01/26
- Re: Default number of overwrites in shred, Pádraig Brady, 2009/01/26
- Re: Default number of overwrites in shred, HggdH, 2009/01/26