Windows Server 2003 enabled the encryption of offline storage. Offline file storage is a process CompTIA A+ Practical Application that provides online storage of files on a file server and on the desktop. When a user is online, she works with files stored on the server. Files can be periodi-cally or manually synched with the desktop. When the desktop system is not con-nected to the network, the user can still work with the files because she is working with a locally stored copy of the file.
Windows 2000 introduced the offline file storage system, but you could not encrypt the offline file storage. This meant that sensitive files could be exposed if the computer was stolen. Users who traveled with company-issued laptops had the convenience of bringing files along with them, but they could not protect the files with encryption.
Windows Server 2003 and Windows XP Professional provide the solution to that problem. The offline file storage area can now be encrypted. However, the entire storage area must be encrypted?you cannot choose to encrypt file by file or just for the user. Offline files are encrypted with the SYSTEM account's private key. Consequently, EPS offers little protection against a skilled attacker comptia security+ who has taken physical possession of the computer.
File recovery can be a management nightmare and an iffy situation when self-signed certificates are used. One solution is the development of a PKI to manage EFS. Before doing so, consider the following:
Consider the PKI design.If no PKI exists,a considerable investment in time must be spent planning the PKI and the use of the PKI to deploy EFS certificates.The security of the EFS encrypted files is dependent on the security of the CA that issues the EFS certificates and EFS recovery agent certificates. This server should be secured.
Consider EFS key backup.Establishing a PKI for the management of EFS certificates does not automatically provide EFS key backup. You still should back up
critical EFS keys such as those issued to file recovery agents.Consider file recovery agents.You can create as many file recovery agents as
you want. It might be appropriate to create file recovery agent accounts for specific free A+ practice exams. This can split the responsibility and provide tighter control over EFS encrypted files.
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