Home » Windows “Back Up Your File Encryption Certificate and Key” Prompt at Login

Windows “Back Up Your File Encryption Certificate and Key” Prompt at Login

After a reboot of my Windows 10 PC today I was surprised to see this Encrypting File System (EFS) dialog pop up asking me to “Back up your file encryption certificate and key”.

efs

I do have BitLocker enabled for the disks in this computer, but I’m quite sure I haven’t used EFS to encrypt any files. It’s been a few years since I needed to use Cipher.exe to do anything EFS-related, so I read the TechNet documentation to work out which switches to use to search my drives for encrypted files.

From a CMD prompt it’s as simple as running “cipher.exe /u /n”.

As it turns out, the root cause in this case is the OPX4.auth file that is on my system because of 1Password. Since there is no EFS-encrypted files on my PC it was safe to choose “Never back up” for that EFS prompt.

Paul is a technical writer, published author, and Pluralsight trainer living in Brisbane, Australia. He is a Microsoft MVP and runs the Practical 365 website. Say hi on Twitter.
Category: Technology

Leave a Reply

Your email address will not be published. Required fields are marked *