Secure deletion of data.

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2
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0answers
18 views

Are deleted offline calendar events in Android actually deleted?

When an Android app deletes a calendar event in a local (offline / non-synced) calendar, does Android's Calendar Storage (com.android.providers.calendar) actually delete the event or does it just flag ...
5
votes
3answers
83 views

Are files deleted before encrypting then formatted able to be retrieved?

On a drive I have a folder of files, I then just soft delete these files (not wiping them or overwriting with any data). After I soft delete them I encrypt the drive and wipe it with a single quick ...
3
votes
1answer
86 views

How to securely delete full vm

We have a Windows 7 virtual machine on VMware Workstation 11. The VM is now encrypted (using Workstation) but wasn’t always. The VM has confidential information on it and as we no longer need it, we ...
2
votes
2answers
47 views

Can a full SSD or HDD recover deleted data?

I've always been curious. It may be a stupid question but what if you deleted a file then filled up the SSD or HDD. Could your deleted data be recovered or is it physically impossible? I know Windows ...
22
votes
3answers
3k views

To what extent does formatting a disk (securely) remove its data?

If the goal is to make data no longer retrievable, how secure is it to format the disk? I assumed formatting the disk overwrites free space (thus making it a safe bet no one's going to be able to ...
4
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0answers
66 views

Cases where DBAN has won

Are there any real life cases where software such as DBAN (to securely erase disks) has beaten government/law enforcement agencies? I found this online which lists each time encryption has beaten ...
8
votes
2answers
202 views

Magnet to wipe HDD [duplicate]

This question is for HDD, not SDD. Would a Neodymium magnet like this one be strong enough to wipe the contents of a hard disk drive? How long would such an act take to destroy any data so it's not ...
0
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2answers
86 views

How reliable is the method of overwriting deleted files with large files? [duplicate]

In addition to the question posted regarding purging data without formatting and the ability to recover data with forensic tools, how reliable is the method regarding overwriting with large file sets? ...
-3
votes
2answers
75 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 ...
0
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1answer
191 views

Is there a risk that file shredders and free space wipers steal our confidential data?

I was wondering how secure are the file shredding software and free space wipers? Lets say we are using PC Windows, and software CCleaner (from piriform) or File Shredder (found here) to securely ...
2
votes
2answers
138 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 ...
80
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 ...
2
votes
1answer
43 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 ...
6
votes
1answer
116 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 ...
5
votes
2answers
191 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? ...
5
votes
2answers
101 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
432 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
66 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 ...
3
votes
1answer
110 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 ...
22
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 ...
2
votes
0answers
52 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 ...
1
vote
1answer
48 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 ...
20
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
1answer
63 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 ...
4
votes
1answer
131 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 ...
11
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2answers
962 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
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0answers
33 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 ...
1
vote
4answers
198 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 ...
2
votes
2answers
147 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 ...
3
votes
2answers
242 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 ...
19
votes
4answers
4k 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 ...
3
votes
3answers
866 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
176 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) ...
1
vote
1answer
163 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 ...
1
vote
1answer
870 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
65 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 ...
0
votes
3answers
849 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 ...
8
votes
2answers
582 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 ...
4
votes
1answer
877 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 ...
11
votes
3answers
2k views

Why are drives overwritten three times when being disposed of? [duplicate]

I am looking at the secure disposal of old flash drives, and one of the standards I have come across says that they should be overwritten three times. Why is one time not enough? I assume doing the ...
2
votes
1answer
209 views

shred - different device size

When I need to properly wipe a harddrive, I tend to use shred on the whole device, i.e. pointing shred to the /dev/sdX without regard to particular partitions; however I noticed that the device size ...
5
votes
1answer
117 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 ...
0
votes
2answers
3k views

What is the difference between wiping vs deleting? [duplicate]

I was reading about the Mask malware on Kaspersky. And they mentioned this: “Several reasons make us believe this could be a nation-state sponsored campaign. First of all, we observed a very ...
0
votes
1answer
407 views

Does microwaving a CD erase it?

I just read the question: Does microwaving a hard drive erase it? and now I am curious too... does microwaving a CD (or for that matter, DVD, or blu-ray) erase it? My initial thought is that some ...
3
votes
1answer
6k 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 ...
9
votes
6answers
16k 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 ...
12
votes
2answers
15k 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 ...
0
votes
1answer
1k views

Securely wipe external drive with Windows only [duplicate]

Consider following 2 disk wipe procedures, using only vanilla Windows installation: First do a quick-format to make the disk appear empty, then do one of these: Just do full format of the disk. ...
3
votes
3answers
1k views

Protect partition from formatting

How can i protect my Linux and Windows partitions from being wiped,from a windows installation CD,with password?
4
votes
1answer
81 views

What is the security significance of Keyboard and Touchpad controller chips?

In this article from Privacy International, it indicates that when GCHQ undertook the task of destroying sensitive data on system belonging to the Guardian newspaper, in addition to the Storage media, ...