Secure deletion of data.

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0answers
30 views

How can I detect screenshots? [migrated]

I was wondering if a program can check if another (unknown) process is taking screenshots regularly? System: windows 7 environment. My program is a java program that takes screenshots ( say 100 per ...
-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 ...
0
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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 ...
0
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1answer
56 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 ...
2
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2answers
59 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 ...
79
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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
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
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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 ...
5
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2answers
116 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
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2answers
89 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
58 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
70 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 ...
20
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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 ...
0
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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 ...
1
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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 ...
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
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
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1answer
99 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
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2answers
609 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
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 ...
2
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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 ...
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 ...
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 ...
3
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3answers
532 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
150 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) ...
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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 ...
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1answer
636 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 ...
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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 ...
0
votes
3answers
626 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
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 ...
4
votes
1answer
834 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
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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
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 ...
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2answers
2k 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
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1answer
349 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
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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 ...
4
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 ...
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 ...
0
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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
918 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
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1answer
75 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, ...
2
votes
1answer
196 views

Tools for Verifying Secure Deletion [closed]

It is recommended to verify the zeroing-out was done properly when you try to secure delete a HDD. From this post, some drives with firmware bugs prevent secure erase from working properly. What are ...
0
votes
1answer
415 views

Securely erase data from a flash drive vs hard disk [duplicate]

I'm studying for an exam, that's why I don't need software for that purpose (which is what other questions I found on this topic provide) but an explanation. The concrete questions I'm trying to ...
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2answers
3k views

How to prevent user from recovering my iPhone data?

If I'm about to sell my iPhone 5, is there a way to make sure that the buyer won't be able to recover anything from my data? Both data that has been recently deleted and data that has been deleted ...
4
votes
2answers
117 views

What are the benefits of having multiple overwriting patterns for secure deletion? [duplicate]

When installing a new AIX server, there is a possibility to use several patterns for secure deletion. My question: Is it necessary to use several patterns? What is the benefit from having several ...
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3answers
3k views

Decrypting a Truecrypt system - how to make deleted files unrecoverable? [duplicate]

If I have full disk encryption on my computer and want to decrypt it, but want to delete senstive documents before decrypting, how do I ensure they are unrecoverable post-decryption? Edit: I suspect ...
4
votes
2answers
1k views

Can you securely wipe an SSD by filling the remaining space with bogus data? [duplicate]

It's been established that, thanks to our good friend Mr. Wear Leveler, wiping data from an SSD is very difficult. I understand that the one thing you don't want to do is actually attempt to shred ...