Re: [vox-tech] Secure Wiping hard drives

2012-05-12 Thread Rick Moen
Quoting Brian Lavender (br...@brie.com): I would think that writing zeros to the disk would make the data unavailable in many cases and is relatively fast. IIRC, DBAN takes multiple passes with pseudorandom data. What if the fact that a melted disk leaked information? Yeah, you go tell

[vox-tech] Secure Wiping hard drives

2012-05-11 Thread Darth Borehd
We need a fast way to securely wipe hard drives. Is there really any way to recover data after doing 1 pass writing zeros to every sector? (This is what we are doing now using the free version of Active Killbits, but it takes over an hour per hard drive.) If we repartition and reformat Windows

Re: [vox-tech] Secure Wiping hard drives

2012-05-11 Thread Alex Mandel
On 05/11/2012 09:32 AM, Darth Borehd wrote: We need a fast way to securely wipe hard drives. Is there really any way to recover data after doing 1 pass writing zeros to every sector? (This is what we are doing now using the free version of Active Killbits, but it takes over an hour per hard

Re: [vox-tech] Secure Wiping hard drives

2012-05-11 Thread Rod Roark
DBAN looks like it will do what you want: http://www.dban.org/ But you can't securely erase a drive without writing to every sector, and that will take time. More challenging is how to securely dispose of a defective drive. I'd use a sledgehammer. Do a cost analysis and maybe a solution for

Re: [vox-tech] Secure Wiping hard drives

2012-05-11 Thread Rick Moen
Quoting Darth Borehd (darth.bor...@gmail.com): We need a fast way to securely wipe hard drives. _How_ secure? LLNL actually melts the platters on hard drives retired from their security-sensitive computing vaults. Commercial operations generally consider DBAN good enough.

Re: [vox-tech] Secure Wiping hard drives

2012-05-11 Thread Darth Borehd
How secure is a single pass zero-fill? As secure as that. On 11 May 2012 10:25, Rick Moen r...@linuxmafia.com wrote: Quoting Darth Borehd (darth.bor...@gmail.com): We need a fast way to securely wipe hard drives. _How_ secure? LLNL actually melts the platters on hard drives retired

Re: [vox-tech] Secure Wiping hard drives

2012-05-11 Thread Brian Lavender
I second DBAN. Writing zeros may seem effective and probably can be in certain cases, but if you think about it, all those zeros could easily be represented in one small portion and the remainder be the old data. There is no way to store random data in a caching mechanism, so it would have to

Re: [vox-tech] Secure Wiping hard drives

2012-05-11 Thread Tony Cratz
On 05/11/2012 10:21 AM, Rod Roark wrote: DBAN looks like it will do what you want: http://www.dban.org/ There is also the program 'scrub' which can do a full secure wipe of the drive. Tony

Re: [vox-tech] Secure Wiping hard drives

2012-05-11 Thread Eric Lin
I believe shred could also do the job. shred -u -z On May 11, 2012 11:14 AM, Tony Cratz cr...@hematite.com wrote: On 05/11/2012 10:21 AM, Rod Roark wrote: DBAN looks like it will do what you want: http://www.dban.org/ There is also the program 'scrub' which can do a full

Re: [vox-tech] Secure Wiping hard drives

2012-05-11 Thread Ryan Northrup
Repartitioning will do very little; though it certainly makes the files seem to disappear, data recovery software can still find the individual ones and zeroes and read them as raw files (no metadata like filenames, but the data itself is still there). So yeah, using the dd command or a dedicated

Re: [vox-tech] Secure Wiping hard drives

2012-05-11 Thread Dr. Denny Scronek
, Eric Lin notapplicable.h...@gmail.com wrote: From: Eric Lin notapplicable.h...@gmail.com Subject: Re: [vox-tech] Secure Wiping hard drives To: lugod's technical discussion forum vox-tech@lists.lugod.org Date: Friday, May 11, 2012, 12:44 PM I believe shred could also do the job. shred -u -z On May

Re: [vox-tech] Secure Wiping hard drives

2012-05-11 Thread Brian Lavender
Reply to author perhaps? On Fri, May 11, 2012 at 02:42:49PM -0700, Dr. Denny Scronek wrote: Hi guy. Next week is Sac State finals week ,,, things are slowing down. -- Brian Lavender http://www.brie.com/brian/ There are two ways of constructing a software design. One way is to make

Re: [vox-tech] Secure Wiping hard drives

2012-05-11 Thread Brian Lavender
On Fri, May 11, 2012 at 10:25:02AM -0700, Rick Moen wrote: Quoting Darth Borehd (darth.bor...@gmail.com): We need a fast way to securely wipe hard drives. _How_ secure? LLNL actually melts the platters on hard drives retired from their security-sensitive computing vaults. I would think

Re: [vox-tech] Secure Wiping hard drives

2012-05-11 Thread Norm Matloff
Zeroing out all bytes gives some level of security, but is not enough against a truly determined adversary who has lots of resources, according to what I've read. A disk drive, being a mechanical device, will write to a slightly different physical spot each time it writes to a particular bit

Re: [vox-tech] Secure Wiping hard drives

2012-05-11 Thread Harold Lee
There are a bunch of secure delete programs that one-up dd by overwriting the file many times, asking the OS to sync the changes to disk immediately, etc. srm, wipe, shred and diskscrub documentation all reference a paper by Peter Gutmann: Secure Deletion of Data from Magnetic and Solid-State

Re: [vox-tech] Secure Wiping hard drives

2012-05-11 Thread Bill Broadley
On 05/11/2012 09:32 AM, Darth Borehd wrote: We need a fast way to securely wipe hard drives. As you might imagine the faster the less secure. Are you trying to protect against: * A determined attacker with a $10M budget? * An expert willing to do disk surgery? * Someone that wants 99% of the