Questions tagged [efs]

EFS (or Encrypting File System) is a feature included in some high-end versions of Windows Vista and 7 which allows the user to encrypt data on a filesystem level.

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30
votes
7answers
34k views

I started getting a weird message “Encrypting file system - Back up your file encryption key”

I started getting a strange message when I start my computer. An icon appears in the system tray, and a popup tells me "Encrypting file system - Back up your file encryption key". I know what EFS is, ...
12
votes
2answers
6k views

Accessing EFS-encrypted files after resetting Windows password

I have some EFS-encrypted files in Windows. The owning user account is protected by a password, which can be easily bypassed (i.e. reset) by many tools and methods. So what will happen to these ...
11
votes
2answers
3k views

I've lost access to my encrypted files

I have an account on Windows Server 2008 R2, which at the moment I am using as a desktop. I had certain files encrypted under a standard user account. I changed my password, and then lost power ...
10
votes
6answers
43k views

How to remove Encrypted flag when copying a file from a HDD to a USB drive?

Environment: Windows 7, but applies to other EFS-compatible Windows versions I have a file that is encrypted using standard Windows EFS encryption. When I copy that file to a USB drive using Total ...
7
votes
3answers
5k views

EFS - Find out what's encrypted

Since a few days when I start Windows Vista i get a Popup from "Encrypting File System" (coming from process efsui.exe) asking me to backup the certificate and key. I don't know what i did to get ...
7
votes
1answer
3k views

How do I let the SYSTEM account use EFS encryption?

I want to encrypt some files used by a Windows service running as Local System (i.e. using the NT AUTHORITY\SYSTEM account). Since BitLocker doesn't seem to work with software RAID, EFS seems to be ...
7
votes
1answer
976 views

Encrypting search index using EFS

Is there anything wrong with encrypting the search index with EFS while letting the search service index encrypted files? I've encrypted the directory %ProgramData%\Microsoft\Search and I've added ...
6
votes
2answers
24k views

File Access Denied despite being administrator, owning the files, and having full permissions

I'm trying to copy data from my old laptops hard drive to my new desktop's. But on a certain folder, I can't copy any of the actual files - just the subfolders. I am informed that I require permission ...
6
votes
1answer
975 views

Getting Through EFS (Encrypted File System)

I'm 99% sure, at this point, that the answer is, "not possible." But I figured there are tons of smart people here who might be able to help me out, even if that help is just to validate that it's not ...
6
votes
1answer
2k views

How to use backup EFS certificate to decrypt encrypted files?

I have some files that were encrypted on a now extinct Windows 7 system. I made sure to backup my keys, this one is called efs.pfx. Double-clicking it launches the Certificate Import Wizard which ...
6
votes
2answers
4k views

Windows 8 EFS: How to tell windows to use “this” certificate for EFS encryption?

On Windows 8, I turned on EFS and encrypted some files/folders. During this process, it created a self signed certificate and used that one for encryption. However, I have a specific certificate that ...
5
votes
2answers
6k views

Decrypt EFS files

Here's my situation. Was using EFS on my Vista laptop - had a backup of my certificate. HD crashed...managed to recover some of my files (Encrypted) - but they "lost" the "Encrypted" attribute in ...
5
votes
3answers
5k views

EFS disallows me from decrypting files on Windows 7?

I have a large folder with a lot of personal photos that I would like to copy. But Windows 7 won't let me. Apparently they are encrypted. I can't remember setting that, nor can I remember any sort of ...
5
votes
2answers
1k views

Get EFS to release file so that it can be deleted

I tried to encrypt a very large file 100+ gig using EFS and canceled when it said it was going to take 12 hours. Cancellation hung until I finally rebooted the system and now I'm unable to delete the ...
4
votes
1answer
12k views

What are differences between EFS and BitLocker in Windows? [closed]

We learned in MCITP about their features. Are there any conflicts between EFS and BitLocker? Can we use both of them together? If so, how?
4
votes
2answers
1k views

What happens with EFS-encrypted files, if I install Windows 7?

I'm going to update my OS from Vista to Windows 7. I got some files (not on the OS-partition) encrypted with EFS. What happens if I install Windows 7? Will I still be able to access my files?
4
votes
1answer
580 views

Encrypting a folder

I'm familiar with bitlocker, having been using it for a while, but I am looking at just encrypting a folder instead. But I just don't understand the options it's giving me. When I right-click a ...
4
votes
1answer
474 views

Strange temporary “Access denied” error accessing encrypted files

After a system reboot (Win7 x64), an application reported that it couldn't access a file in an EFS-encrypted directory. Accessing via programs gave "Access denied". Permissions were normal and fine. ...
4
votes
1answer
4k views

Windows 7: EFS and Windows backup (system image) - Certificates not included?

I just encrypted my C:\Users\Username folder with EFS. I also backed up my EFS certificate (.pfx). Now I wanted to do a backup of my computer on an external HDD. I want to use the integrated Windows ...
4
votes
1answer
4k views

EFS recovery from backed up registry files?

Here's what I have: Backed up encrypted files Backed up registry files (ntuser.dat) password The original OS (Windows XP) hosting the EFS encrypted files is gone. I do not have a backed up key file....
4
votes
0answers
1k views

Is this a ransomware?

I just got this window on my main computer: Apparently, it's from Windows. I checked, and the process EXE file is the original one (efsui.exe or something like that). However, I don't use EFS (I ...
3
votes
1answer
109 views

Windows EFS encryption

I'm using Bitlocker for a full disk encryption solution. However, I'd like to avoid having to shut down my computer to leave it in a secure state. If I enable EFS encryption on the folders which I ...
3
votes
1answer
7k views

Who can decrypt EFS files?

I'm running Windows 7 Professional at home and decided to encrypt some of my files using the built-in EFS. My understanding is that only the account that encrypted the files can also read them again - ...
3
votes
1answer
4k views

BitLocker vs. Encrypting File System (EFS) on Windows 7

So BitLocker encrypts the entire hard drive, while EFS encrypts individual files. Is there any difference in the way that they implement the encryption? Do they both use your user account password as ...
3
votes
0answers
2k views

Decrypt EFS-encrypted file (I do have certificate backup)

I have an encrypted folder on a Windows 8 machine, which was encrypted by another user-account (which I cannot boot into due to a corrupted profile). But I do have the private-key backup certificate ...
3
votes
3answers
6k views

Vulnerability of EFS (Encrypting File System) on Windows 7

I am looking into using EFS (Encrypting File System) at file/folder level on Windows 7. I read Wikipedia article on EFS and it does mention several vulnerabilities related to Windows 2000 and XP. ...
2
votes
3answers
423 views

Can the SAM database be encrypted with EFS to prevent offline password cracking?

Is it possible to EFS-encrypt the SAM database to prevent offline password cracking? Would it have to be encrypted as the SYSTEM user?
2
votes
3answers
1k views

Encrypting %userprofile% using EFS?

Is it safe to encrypt my Windows 7 %userprofile% folder using EFS ? i.e. are applications or system logon going to be affected?
2
votes
1answer
4k views

How to disable Encrypting File System

I accidentally (believe it or not) enabled Encrypting File System on Windows 7 that uses my personal certificate. I don't need the encryption, and I don't want to be stuck with inaccessible files in ...
2
votes
2answers
1k views

NTFS Directory is encrypted AND compressed?

I was running EFSINFO on my WinXP SP3 machine today, trying to find any EFS-encrypted files on the system. Imagine my surprise when I discovered my C:\xampp\htdocs\ directory is both NTFS-compressed ...
2
votes
1answer
67 views

How are individual files encrypted?

I think the process is called EFS and in most cases the encryption of the key used to encrypt the file by an asymmetric cipher but what I don't understand is how exactly the files are encrypted. Now ...
2
votes
1answer
327 views

Encryption software as easy to use as EFS

Is there any encryption software that works as transparently to the user as the built in EFS? I am trying to create a relatively secure folder for the users to store documents in, but with some users ...
2
votes
2answers
3k views

Unexpected Access Denied error while accessing EFS encrypted file

I am getting Access Denied error when I try to access some files. ACL is OK, all ACE's all intherited, I have full access to these files and I am the owner of these files. ACE's are exactly same as ...
2
votes
1answer
401 views

Windows 7 EFS, where are the FEK stored?

I feel confuse, I read from many technical doc from Microsoft and wiki. The FEK is generated for each file, and store in the file headers. But refer to this blog windows-7-how-to-use-cipher-exe-a-...
2
votes
3answers
3k views

Can't export Windows 10 EFS certificate

Just got a new laptop and encrypted a couple of folders, the handy "export certificate" reminder popped up, so I exported it. Job done. This reminded me to check I had backed up my other computers' ...
2
votes
1answer
846 views

Can I use EFS to encrypt the user directory?

I want to know if doing so would prevent windows from logging in to the user or not, has anyone tried to encrypt the user profile folder or the windows folder?
2
votes
1answer
103 views

EFS File not accessable after reboot

I have encrypted a file with EFS for a user (let us name this "User X"). An application which is running as "User X", is able to access the encrypted file. It keeps working fine across log off and log ...
2
votes
1answer
169 views

Mounting old home directory from Windows 7 Image

I used dd to create an entire image of my hard drive before I reformatted. Windows 7 was installed. I've mounted that image using OSFMount (which, by the way, works great!). The problem I'm ...
2
votes
1answer
262 views

Why are some folders green colored on an external drive in Windows? [closed]

i just did a reinstalation of windows, noobish as i am i didnt notice the green colored folders on my external harddrive as i copyed my most beloved files. so i wonder if there is anyway to get pas ...
2
votes
0answers
184 views

Windows 7 Unzip downloaded archives are Encrypted - EFS

Basically when I download a zip archive, typically in chrome, but this happens in Mozilla as well, the files in the archive are encrypted (EFS) when I unzip them. Not password protected or anything ...
2
votes
1answer
431 views

container mounting fails after moving Docker files (images) to AWS EFS NFS mounted volume

Recently switched my AWS EC2 ubuntu 14.04 instance from using a ebs volume to the newish EFS. That all works great and I moved for example all my owncloud data there. Now I wanted to move my docker ...
2
votes
0answers
2k views

How to turn off EDP on Windows 10

Since Windows 10 automatically updated to the latest version (November 2015 update I believe), all my EFS files are flagged with a lock icon. And when I copy an EFS-encrypted file to a FAT drive, it ...
2
votes
0answers
298 views

Backup EFS encryption key generated, but no encrypted files? Track what caused the key creation

In I started getting a weird message "Encrypting file system - Back up your file encryption key" a user experiences a prompt that I also experienced yesterday for the first time. Now the ...
2
votes
1answer
279 views

Recover EFS Certificate from dead Motherboard

I created an encrypted file with Windows 7 32-bit on a NAS (mybooklive) and backed the file (not the certificate) up locally to the computer's hard drive. The original Win7 computer had a motherboard ...
2
votes
0answers
604 views

2 users cannot share one encrypted offline files share

This question I asked over a year ago in the MS social forums, with the answer being that by design it is not possible. I still wonder whether one could hack around this limitation, without using ...
2
votes
2answers
3k views

EFS not available on Windows 7 Home Premium: workarounds?

This may well be an easy question to answer. I am running Windows 7 Home Premium and my hard disk's file system is set to NTFS which in theory should support EFS. However I've read that EFS is only ...
1
vote
1answer
2k views

File encrypted on old PC, need to decrypt [duplicate]

Possible Duplicate: Getting Through EFS (Encrypted File System) My dad encrypted a file on a PC running Win XP. He got a new PC running Win 7. There were some files encrypted using Windows EFS ...
1
vote
2answers
309 views

How do a run EFS decrypt on a directory?

In that directory, there's a mix of EFS-encrypted files, and just normal files. Is there a simple way to decrypt everything?
1
vote
1answer
42 views

Why does an EFS-encrypted file get decrypted when it gets uploaded to the Internet?

Why is an EFS-encrypted file decrypted when it gets uploaded to the Internet?
1
vote
1answer
50 views

Are there any major risks to running a windows service as the login user?

Are there any risks to running a service as the admin (and login) user on a Windows 10 machine? For instance, will the password be stored on disk in a manner accessible to someone with physical access ...