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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How to solve permission error when my user is owner of the file and I can't access from administrator user either

I used Microsoft encryption to encrypt my Office files but now it says you need permission to open this file while opening. I am opening the file with the user which is owner of the files and I have ...
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75 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 ...
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use EFS certificate on multiple computers to encrypt and read files

What I want is to create a single EFS cert for use on multiple computers to encrypt/decrypt files. I have two computers, PC1 and PC2, and when I try to copy PC1's encrypted files to PC2, these files ...
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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?
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Will the contents of an encrypted file from a local disk be visible to others when uploaded to the Internet?

If I encrypt the contents of a file through File Explorer in Windows 10 (Properties -> Attributes -> Advanced) and upload it to the internet (cloud, attachment in an email, etc.), will I still be the ...
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WIP/EFS shows protection on Network shares

Maybe someone has experience: The device is joined to the on-premise domain User mapping network drive from DFS share from domain The on-premise domain is as an example: space.local User Enroll ...
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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 ...
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Encrypting File System (EFS) in Windows 10 block Preview Pane

When files encrypted by Encrypting File System (EFS), the Preview Pane not work for PDF or Office docs. Would be good to understand if it is default setup of this solution with some link to official ...
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26 views

Can I give the EFS public key to others?

Using EFS to encrypt a file on Windows 10. Does EFS use public/private key pairs? If it does, does that mean I can give the public part of the key to others, so they can encrypt files and send them ...
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137 views

How to use windows 10 personal certificates to encrypt a file

Using Windows 10 "Manage your file encryption certificates", I have a valid certificate. How do I use this certificate to encrypt a file? I have tried: Right click file Select properties Select ...
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System won't restart after Windows Update. Is there a way to pull EFS files off the system?

I'm trying to fix a system where the user account was encrypted using Windows 10's cipher command. The user tried to update Windows and it got stuck in a reboot loop. As Windows can't start, I cannot ...
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Windows EFS vs Windows Backup

I have just encrypted some folders holding my personal data using EFS on Windows 10 Pro. I had also configured Windows backup (using "Backup and Restore (Windows 7)" Control Panel applet) some time ...
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110 views

Problems with Encrypted Files

I was having problems with my main drive and decided to upgrade to a new SSD for my boot drive. Upon installing Windows I realized I could not access any of my encrypted files due to not having that ...
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EFS recovery in windows 7 after reinstalling windows

My brother formatted my PC, removed the older version of windows 7 and installed a new version. Before he formatted it, I encrypted some files using EFS in windows 7, I was using an account name: AAAA....
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321 views

Unable to decrypt EFS files with cipher command

I tried to decrypt a EFS file with the built-in cipher command: cipher -d "D:\sample.txt", and here's the output: Listing C:\Windows\System32\ New files added to this directory will not be encrypted. ...
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307 views

Is there any benefit of using bitlocker and efs together?

Example: Bitlocker: during encryption process, the pc got shutdown suddenly due to power failure, part of the data will be left unencrypted, which intruder can gain access to. I'm thinking will ...
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152 views

Creating a .pfx or PKCS#12 file from PFX or other external

Reading the fine manual, I can copy and/or export all the required credentials to another Windows machine for import after exporting: Figure 1: Exporting the Encrypting File System key Right-...
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How to decrypt EFS encrypted files from Linux

Because the regular decrypt procedure with cipher fails, looking for alternatives. Along the lines of this exercise: Goal You have succeeded once you know the content of the encrypted file... ...
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98 views

EFS sync task failing with Restart Call

We have on-premise sync agent running. Every now and then sync task is failing with Restart call (Shows under activity under history tab). What could be the issue ? I could not find any information ...
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482 views

EFS file security not retained when transferring, what's the point?

I only recently decided to implement EFS as a security measure, but during testing with an encrypted file, I found these shortcomings: You can copy an encrypted file to a USB drive, then transfer it ...
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EFS-encrypted files jumbled right after encryption

One of our users was running Windows 10 Home. She upgraded to Windows 10 Professional specifically for EFS. With the upgrade complete, she right-clicked on her Documents folder, Properties, Advanced, ...
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854 views

Domain Administrator unable to decrypt files with EFS recovery certificate

I have some files on the drive of a domain controller running Windows Server 2008 R2 which are encrypted via EFS. The user that originally encrypted the files no longer exists. When I look at the ...
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2k views

How do I keep 2 EFS instances in sync across regions

My company has an application running with multiple EC2 instances sharing 1 EFS instance that holds our application's files in the US East region, however our application is used nationally and our ...
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2k views

Could EFS files be opened on a different PC?

Let's suppose I've used EFS (Encrypt contents to secure data) to encrypt a folder containing several files on my Windows 7 / 10 PC. I then copy the encrypted folder to an external hard drive. The ...
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Windows 10 not using imported cert to decrypt EFS files

I encrypted some files with Windows's built-in EFS encryption, which involved creating a new EFS certificate and saving a backup of it somewhere. I recently swapped motherboards/re-imaged my PC and ...
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729 views

how to decrypt an encrypted file from a old account

So awhile back I was just testing out the encryption thing to just see what all it did and how it works etc. Little did I know I forgot to decrypt them before I formatted disk. I do still have all the ...
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246 views

Temporarily read an EFS-encrypted folder on someone else's computer

Example situation: You have an external USB hard drive with a folder D:\Work\ encrypted with EFS, and you want to copy a few files from it to your colleague Bob's computer You plug the external USB ...
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140 views

Setting up EBS/EFS disk storage for disaster recovery

I am thinking about how to best setup a couple of environments on AWS. I would like to setup two servers: Application server (running web application and REST services) Tools server (running several ...
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634 views

How to use a hard drive containing EFS-encrypted files on another computer?

I'm starting to use EFS feature to encrypt several folders of my hard drive, using Right click > Properties > Advanced > Encrypt contents to secure data (see screenshot). At the end of the process, a ...
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104 views

Enable EFS for whole system partition

When I try to apply EFS for the Windows system partition, there's many files error with "access denied". How to override the restriction?
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88 views

Is it possible to re-create certificate that was created with EFS?

I have some files that are encrypted with EFS. I do not have the certificate to decrypt. But I do know the username, computer name, password, etc. that were used when the files were created. Is there ...
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762 views

Windows server 2012 DRA (Data recovery agent) account not able to decrypt files

I have a Windows Server 2012 R2, Hyper V VM acting as a domain controller (for domain parihar.local). I am setting up EFS (Encrypted File System) on the same and am running into a very specific issue ...
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135 views

broken encrypted files after reformat

I had some files encrypted with cipher cmd command on an external hard drive with FAT32 format. one day I had to copy a large file on that hard drive and I reformated the hard drive to NTFS format. ...
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247 views

what happen if I use 7zip to compress EFS-encrypted files to create a new zip

is the EFS-encrypted files decrypted automatically and save to the new zip file? So I can give the zip file to another user/external parties, to open it without any EFS keys?
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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-...
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How does EFS use the user account to decrypt files?

My company uses pGina on its Windows machines so that we can log in using our LDAP accounts without Active Directory. Last week I accidentally entered my account password unmasked while SSH'd into one ...
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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 ...
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433 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 ...
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461 views

Recover Encrypted Data from windows.old (WIN10)

I recently had to reinstall windows 10 because it became unusable. I've got all my data back from windows.old and other sources but... Without me realizing it, windows had encrypted some of the data ...
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2k views

How to copy encrypted files to shared folder retaining encryption?

I'm copying a folder from local HDD to a remote shared folder. Both systems are Windows 7 SP1, members of the same domain, I am logged in as a domain user and the files are owned by that user. There ...
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547 views

How do I recover Windows EFS keys

Long before my hard drive crashed I backed it up using Acronis TrueImage 2010, a full partition backup of Windows 7 Professional 64bits. Oddly enough, the C OS partition is the placed as the second ...
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850 views

EFS and encrypting new files automatically

I have an issue where files are not always being encrypted. I did a right-click and set the folder to encrypt all sub-folders and files when they are dropped in. As of right now, new files are not ...
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108 views

Is the EFS key of all accounts associated with the same Microsoft account the same?

My boot hard drive stopped working but I had backed up all the files on an external hard drive and encrypted it with EFS prior to this. I unfortunately did not make a backup of the key and so was ...
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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 ...
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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' ...
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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 ...
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429 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?
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445 views

Which windows services are ok to: SC Type= own?

Looking at the best answer to "How to find memory usage of individual Windows services" posted on Server Fault it looks like SC Config ServiceName Type= own is the best way to 'split-off' services ...
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247 views

Backed-up EFS certificate doesn't work after resetting password

I'm on a Windows Vista computer. I've wanted to use EFS for a little while but I wanted to experiment on some individual files first. While doing that, I backed up my certificate and key, reset my ...
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1k views

Delete EFS encrypted file without certificate

I used to use a Yubikey with a certificate for file encryption. I then modified the encryption certificate on the key assuming I could use the backup certificate stored on a flash drive to decrypt the ...