Questions tagged [file-system]

A file system is a way of organizing information on a storage device like a computer hard drive.

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30
votes
6answers
31k views

How secure is NTFS encryption?

How secure is the data in a encrypted NTFS folder on Windows (XP, 7)? (The encryption option under file|folder -> properties -> advanced -> encrypt.) If the user uses a decent password, can this ...
13
votes
3answers
4k views

How to recover securely deleted data

Since we all know files are recoverable with programs after being deleted from the recycling bin, everyone is told to do secure wipes by putting random data over the files you're deleting on the disk ...
6
votes
4answers
1k 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 ...
6
votes
8answers
13k 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 ...
11
votes
9answers
4k views

Is there any asymmetrically encrypted file system?

Is there a file system providing a directory where everybody can write, but only the directory owner can read the files? In theory it could be done by encrypting using the public key while writing, ...
8
votes
1answer
204 views

Anonymity of sneakernet: identifiable information on removable storage

Alice, an anonymous informant, would like to transmit digital documents to Bob while maintaining her anonymity. For whatever reason, she chooses to copy the documents to some kind of physical ...
8
votes
1answer
3k views

Database encryption or filesystem encryption?

Recently I've been working on some data which, although not directly governed by any infosec laws, is sensitive enough to warrant being encrypted. I'm interested in finding out about best practises ...
8
votes
3answers
595 views

Secure cleaning of deleted files

So I know how to secure delete files. But at our company, we have a laptop which had many important documents, which now have been deleted, but not in a secure way. We can't perform a full format of ...
3
votes
3answers
567 views

Why should the user ID and group ID of every file match an existing user?

I've been reading in most hardening guides for Linux, that you should check for files and directories without valid user or valid group. What I can't find, is how this could be used for an attack, or ...
59
votes
6answers
26k views

Unix execute permission can be easily bypassed. Is it superfluous, or what's the intention behind it?

The unix read permission is actually the same as the execute permission, so if e.g. one process has write access it's also able to execute the same file. This can be done pretty easily:First this ...
8
votes
2answers
659 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 ...
2
votes
3answers
3k views

Do moved files leave a trace on the drive they created on?

I have created a word document on my computer, or any other file like txt, image, PSD etc. Now, I then take that file and move it to an external device, would that file leave a trace on the computer? ...
21
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 ...
4
votes
5answers
8k views

How do I run an unknown .exe file without being in risk [duplicate]

I would like to know whether there is any way I can run an absolutely unknown executable file without being hacked even if the file contains a lot of malicious code. Is there any program in which I ...
2
votes
4answers
5k 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 ...
1
vote
0answers
186 views

Does aslr definitely end the possibility of code execution in the case of filesystems heap overflows?

Local only Filesystems (like ntfs or btrfs) consists of many data structures that require very complex code for parsing them. So, such filesystems if implemented in user space can suffer of buffer ...
-1
votes
1answer
178 views

Would this be plausible for a metamorphic virus? Not repeatedly infecting same system

Would this be plausible for a metamorphic virus? When a new generation (for lack of better word) is created it would hard code a random file name, that would be checked to see if the system was ...
4
votes
5answers
5k views

Is running an erase tool after an OS install sufficient to ensure no data from the old install is recoverable?

How secure do you consider this process? A drive has data from a previous OS installation. A new OS installation is made on the drive, and Heidi Eraser is run on free space. What are the chances of ...
3
votes
1answer
2k views

Which Domain Administrator created file X on a Windows 2008 R2-based server?

Someone created a file (web.config) in a location that basically caused IIS to not work. Is there any way I can determine who created this file? The creator/owner says "Domain Administrators". ...
3
votes
2answers
2k views

What does Gazzang zNcrypt actually protect against?

In an effort to increase security of our website, I'm reading up on Gazzang zNcrypt, which claims to protect data in databases from breaches. Technically, it seems to do filesystem encryption. As far ...
3
votes
2answers
5k views

Uncover data in file slack

Today in class we learned about how information can be uncovered in a file slack. I understand this theoretically, given the physical and logical file size I can come up with the slack space of a file....
3
votes
2answers
406 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 ...
2
votes
5answers
6k views

Prove that you deleted the file

Is it possible to prove a date that you Deleted a file through the recycle bin? I delete a folder of pictures 2 months ago and somebody is asking to prove that I did it.
1
vote
1answer
195 views

How secure is it to store passwords in a non-accessible file?

So, I was thinking about workarounds for saving passwords in text files (just because I'm curious), and I thought, what if I saved my file somewhere that is non-accessible? My server has a public_html ...