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Table Of Contents  CertiGuide to A+ (A+ 4 Real)
 9  Chapter 1: What are Operating Systems and How Do They Work?
      9  File Management

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EFS
(Page 2 of 2)

EFS Recovery Agent



EFS protects files from being accessed by anyone other than the owner of the file, with one important exception – the “EFS Recovery Agent”. This is a role given to a user account (normally the Administrator) which allows them to decrypt any EFS encrypted file on the computer, regardless of what user created it. Outside of the Windows world, the ability to bypass encryption in this way is referred to as “escrow”.

More on Encryption Topics

Key escrow, PKI and encryption are extremely interesting topics, and are covered in more detail in the
CertiGuide to Security+.


The EFS Recovery Agent is intended only for use in emergencies, for example, where an employee encrypts business-critical files and then leaves the company. It is an extremely powerful role and easily open to abuse, reinforcing the security maxim “A computer is only as secure as the administrator is trustworthy”.

It is very important to remember the following rules:

EFS encrypted files are “locked” to an individual user account. If you delete the user account before un-encrypting the files, you will need to use the EFS Recovery Agent to recover the data.

EFS Requirement

EFS only functions on NTFS v5 drives.


When copying an EFS encrypted file or folder from an NTFS v5 drive to a non-NTFS v5 drive (including NTFS v4 drives and floppy disks), the encryption is automatically removed if the user who encrypted the file is the same as the user who is copying the file.


Previous Topic/Section
Encryption?
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Third Party Tools
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