Secure deletion of data.

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32
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6answers
57k views

Can wiped SSD data be recovered?

I was reading another post on destroying IDE drives, and how you could remove data, wipe it, or just destroy the drive. The removed data would still be there in some state, although not easily ...
0
votes
0answers
21 views

Deleted files with numbered names and extension [migrated]

I was reviewing evidence where using EnCase then I saw that there were a significant number of deleted folders and files where their names and extensions were numbers and all had empty content (for ...
-3
votes
2answers
64 views

why don't OSes offer secure file erase/wipe [duplicate]

inspirated from here: Why didn't OSes securely delete files right from the beginning? And why do they still not do this? the point that seems to be taken there is why it is not the default, but ...
3
votes
2answers
206 views

Secure file deletion vs wiping free space

Say I only wanted to delete specific files and want to feel confident they can't be recovered. Is it better to use a specific program (such as Eraser) for wiping only the files, or is it better to ...
79
votes
11answers
19k views

Why didn't OSes securely delete files right from the beginning? And why do they still not do this?

After decades of hearing that "delete" does not really make the data impossible to recover, I have to ask WHY the OS was not corrected long ago to do what it should have been doing all along? What is ...
0
votes
1answer
53 views

File shredders and free space wipers, are really safe to use?

I was wondering these days about , how really secure are the file shredding software , or free space wipers? Lets say we are using PC Windows, and software CCleaner (from piriform) or File Shredder ...
5
votes
4answers
503 views

What's a good secure file deleter

I've used cipher \w which is built into Windows to overwrite free space but I'm looking for a tool that securely deletes files which have not been deleted yet. It would be a plus (but certainly not ...
2
votes
2answers
58 views

Deleted files and their traces

Lets say we delete various files , from hard disk A, with shift - delete , windows 8 . Then we copy new files to the same hard disk A. Then those new files we just copied there to hard disk A, we ...
2
votes
1answer
33 views

What full-disk secure erase solutions exist for SSDs (OS X)? [duplicate]

I want to back up the contents of my Macbook before encrypting it, but after I'm done, I would like to sanitize the SSD that I have backed up my files to, since it will be unencrypted (no point ...
3
votes
0answers
68 views

Method for securely removing files from a solid state drive

I've thought of a method for securely erasing single files on a solid state drive. This method will work only if the drive is encrypted, and it will work even if someone cracks the encryption key for ...
19
votes
1answer
2k views

I forgot to shred a file before deleting it (on Windows). How do I shred that part of file system now where the file was located?

My company has a policy that files have to be shredded after they've been read. They provide with a tool shred.exe that I run on the file and it overwrites it with garbage in the file system before ...
2
votes
4answers
3k views

Writing file shredder

I want to write a simple file shredder in c++, i.e. a program that deletes a file so that it is not recoverable. Would the following be a secure and correct way to do that? (1) Open the file with ...
50
votes
4answers
32k views

Why is writing zeros (or random data) over a hard drive multiple times better than just doing it once?

Lots of different programs, such as Darik's Boot and Nuke, let you write over a hard drive multiple times under the guise of it being more secure than just doing it once. Why?
5
votes
2answers
113 views

Wiping a computer of personal information while keeping the operating system intact

I have a unique situation but will try form this as a generally applicable Q&A: I must leave my Operating System intact, but completely wipe my information from the computer. How can I do this? ...
12
votes
2answers
1k views

Ensure data doesn't linger after being deleted

I'm trying to make a service that keeps as little data on its users as possible. To that end, I want to make sure that someone using forensic tools won't gain any more information than I would by ...
5
votes
2answers
88 views

How to avoid local caches when I open encrypted files

For personal usage I tend to keep things that I want to hide or protect in rar archives encrypted and protected with a password. Today I launched an antivirus scan, and as result it found malware in a ...
3
votes
1answer
384 views

Why does UNIX `shred` command rename files to 000, then 00, then 0 before deleting?

I was using shred to get rid of some files and I noticed that it did the following: shred: 0000: renamed to 000 shred: 000: renamed to 00 shred: 00: renamed to 0 Does anyone know what's the point ...
2
votes
1answer
56 views

Apple's Keychain - good security?

This management system runs under a user's password. Should you let this software manage your Disk Utility encrypted folder passwords and the like (e.g. GnuPG!)? My thoughts are, "No." Why should ...
20
votes
4answers
2k views

Is a file shredder/secure erase necessary when you have full disk encryption turned on?

The password manager that I use has instructions to migrate to a new file format: Export existing passwords to a temporary text file Change password manager to new format Import passwords from ...
3
votes
1answer
4k views

Does microwaving a hard drive erase it?

Kind of a silly question, but I'm genuinely curious: (in part because I recently saw several questions that refer to "nuking" a hard drive...) what would a microwave DO to an HDD? Would it erase data ...
3
votes
1answer
68 views

How long is the information on Facebook stored? [closed]

I was wondering how long Facebook stores our photos and posts? I hear two theories, one saying it is around half a year, after which all the data centers are going to erase our data. The other one ...
1
vote
1answer
45 views

What is the risk of data being recovered from SAN storage after logical deletion?

The specific scenario involves Linux servers on VMware hosts with SAN storage. If files containing sensitive data are deleted by Linux, can they be recovered by a low level tool similar to what might ...
0
votes
0answers
37 views

What is the security value of chattr +s?

Most modern Linux file systems support extended attributes. +s is secure deletion which ensures (at least intends) that the data in a file is overwritten with zeros when the file is deleted. Some ...
6
votes
3answers
219 views

Disk Erasing Security - Odd Number of Writes

As one can find in the Disk Utility/Erase/Security Options section, there are two options for erasing disks securely - zero out 7 times or zero out 35 times. Where these numbers come from?
9
votes
2answers
12k views

What is the difference between ATA Secure Erase and Security Erase? How can I ensure they worked?

I'd like to wipe a stack of drives (spinning and SSD) securely. I'm familiar with the ATA Secure Erase (SE) command via hdparm, but I'm not sure if I should use the Security Erase (SE+) command ...
3
votes
1answer
3k views

Secure erase iOS devices

All iOS devices from the iPhone 3GS have a hardware encryption chip, right? When you erase an iOS device with the "Erase All Content and Settings" menu item or via Remote Wipe the encryption keys are ...
1
vote
1answer
5k views

What method of secure erase is sufficient for MacBook Pro SSD Drives? [duplicate]

I would like to securely erase the hard drive of a SSD in a MacBook Pro. The Disk Utility does not give me the option to wipe this drive even when I boot into the System Partition. (it is greyed ...
60
votes
8answers
15k views

How can I reliably erase all information on a hard drive?

As storage technologies change over time, using different encodings and remappings to deal with sector errors, the best way to permanently erase/wipe/shred data changes also. Methods for flash drives ...
2
votes
1answer
58 views

Would the theory of creating tons of duplicates of a small file, 'wipe' the hard drive?

Mentioned here: https://discussions.apple.com/docs/DOC-5521 I was just curious if this would really work. It makes sense to me. As long as they don't do reverse forensics on the bits on the hard ...
3
votes
1answer
98 views

Overwriting disk with random data vs. encrypted zeros

Most disk encryption guides recommend to overwrite the disk with random data before encryption, this is discussed here. However the time this takes with the "standard" source of random data can be ...
10
votes
2answers
603 views

“Encrypt and wipe” procedure on Android Lollipop?

I know a lot of people are advocating an "encrypt and wipe" procedure for selling used Android phones. But according to the AOSP website, in Android 5.x Lollipop: Created fast encryption, which ...
0
votes
0answers
32 views

Should universal delete, or “the right to be forgotten”, be an extension to OpenID Connect “signout” or authentication in general?

There are different levels of maturity various OpenID connect implementations may have. One of the optional features is the session management and sign out feature. Now that this has finally ...
2
votes
4answers
177 views

Can data be forensically retrieved off an encrypted hard drive?

If a hard drive is encrypted, is it still possible to retrieve data off of it? What about if the password to decrypt it is known? If this is the case, given that OSX now encrypts your drive by ...
3
votes
1answer
2k views

How do you erase a Blackberry without having direct access to the server?

I have a Blackberry with no access to the BIS or BES server that managed it. How does one erase and reset the device to defaults?
14
votes
11answers
15k views

I'm leaving my job and want to erase as many personal details etc. as possible; any tips?

Obviously this is very open-ended. But, I'm just paranoid about people going through everything on my laptop after I leave my job. Here are the things I'm planning to do: Completely wipe all browser ...
6
votes
8answers
429 views

A computing environment that saves no data

I want to use a laptop which doesn’t save any data, history, passwords anywhere in it. All state information should be destroyed once it is turned off or rebooted, without removing my ability to use ...
5
votes
6answers
7k views

Overwriting hard drive to securely delete a file?

I am working on a computer that I am not allowed to install new software on. It does not have secure delete software installed. Suppose I have a file (or files) that are sensitive that I'd like to ...
2
votes
2answers
105 views

Wipe rewriteable optical media (CD, DVD, …) content

There are already several posts here discussing the specificities of magnetic hard disks and SSD and how to properly wipe their content: With magnetic disk a complete overwrite of the disk content ...
19
votes
4answers
3k views

Why is writing zeros (or random data) over a hard drive used when writing all ones is more beneficial? [duplicate]

As far as I know, in order to securely delete the hard drive's contents, one should fill it with zeroes or, for added security and harder recoverability, random data first and then all zeroes. In ...
-4
votes
1answer
192 views

Is there any virus that deletes Personal Folder? [closed]

I noticed that some special folders of my ex-HDD have been deleted. 'Personal' is one of them. Is there any virus that does that?
3
votes
4answers
13k views

How do I securely erase USB flash drives?

I would like to know if there is a way to securely erase USB flash drives without a chance to recover data from it once it has been erased. I know, that programms like DBAN can be used to securely ...
3
votes
3answers
527 views

How do I prevent SSD file recovery?

I use a Kingston V300 SSD (specifically SV300S37A) According to this answer The 'best' modern drives support a vendor-specific secure erase functionality. Examples of this are Intels new 320 ...
4
votes
3answers
149 views

Safely remove original file after encryption

My application encrypts a file, and the result is written to a different one. How do I safely remove the original one (C++)? Update. Wow! The problem is more complicated than I thought of it... 1) ...
5
votes
1answer
113 views

What method could a white-box attacker use to track the deletion of memory / files?

A rather theoretical question: Assuming there is memory with a malware inside it. The malware's goal is to detect if a legit application is about to delete contents of the memory. If recognized, the ...
1
vote
1answer
143 views

Selling HDD - wiping

I am selling my HDD and I want to erase it. I would like to use DBAN, but it doesn't erase HPA and DCO, my question is, does it matter? What data can be here? And my second question - if I wipe HPA ...
0
votes
3answers
621 views

How to secure delete inside a virtual machine?

Here is a tricky one: Can you securely delete a file from a VM? I'm sure the answer is dependent on a million different variables, and I'm sure the answer is something like "not really" but I want ...
1
vote
1answer
632 views

How can I securely delete items in a database?

I know that to securely delete files on a system I have to apply some kind of secure deletion (overwritting empty clusters, for example). But when I want to delete some information on a database ...
-1
votes
1answer
61 views

Undelete-secure AES software and software for carrying out “full undeletion” free-partition-space zeroing/reformatting on Windows?

It is fairly well known that on Windows, when you delete a file (or folder which may contain any number of files and subfolders possibly containing other files and subfolders and so on), Windows just ...
4
votes
1answer
831 views

Is data-remanence a concern in RAM?

I know data-remanence is a concern on hard drives, but is it a concern on RAM? For example, once a program completes, is its data still available on RAM, just as data on a hard drive remains after ...
8
votes
2answers
559 views

Are there any filesystems that have secure deletion as a feature?

There's many 3rd party tools people have designed to perform secure deletion, but I don't know of any filesystems where secure deletion is built in. In fact, secure deletion has to work around ...