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The purpose of the processes operating at the presentation layer is primarily to act as a translator for services operating at the application layer. Often, this takes the form of moving data from a proprietary data type to a universal type and back again. For example, data from the higher application layer is converted from the format that the application uses to a standardized format, and then back again. These conversions allow the layers below the presentation layer (layers 1 to 5) to interact with data in a standardized form. This shields processes at the application layer and the lower layers from having to be aware of data types other than their own. These processes send and receive data in the form they expect to and are unaware of this hidden conversion process. The final outcome is interoperability at the application level. A user on a Windows XP computer can create a document and save it to a server where a user on an Apple Macintosh computer can then gain access to the file. This involves more than a single process to accomplish, but much of the work is done by services at the presentation layer. Converting data types is only the beginning of the functions specified at the presentation layer. Some other common functions such as compression/decompression and data encryption/decryption are also defined at this layer. When a user file is written to a hard disk, a process at the presentation layer might encrypt that file to protect it from unwanted eyes. The application with which the file is being written need not be aware that this decryption or encryption process is even occurring. File sharing protocols that transfer files across the network to and from network shares function at the presentation layer.

Disable hibernation mode on your computer. Configure security settings to clear the paging files every time the computer shuts down.

When a computer hibernates, the contents of system memory and any open files are written to a storage file on the hard drive, and the system is powered off. This saves energy and allows the computer to be restarted with the same applications and files that were open when the system hibernated. However, hibernation can be a security risk because files are decrypted for use in applications. If an encrypted file is opened and then the system is hibernated, the contents of the open encrypted file will be in the hibernation storage file as plaintext. An attacker could potentially access the storage file used during hibernation. For this reason, EFS users might want to disable hibernation so that encrypted files are not placed at risk. If you choose to use hibernation mode, be sure to close any open encrypted files before letting the system hibernate.

Ensuring that communications between two computers are properly established and maintained is the primary function of services operating at the session layer. In networked communications in general, there is a three-step process for establishing a connection between hosts. Step one is the initial establishment of the rules for the logical connection. During this portion of the process, the questions of who gets to transmit

Part III:

To disable hibernation 1. In Control Panel, double-click Performance and Maintenance, and then click Power Options. 2. On the Hibernate tab, clear the Enable hibernate check box. 3. Click Apply.

When a file is encrypted or decrypted, plaintext data can be paged. This can be a security problem if an attacker boots the system by using another operating system and opens the paging file. The paging file can be cleared at shutdown by means of Group Policy. To clear the paging file at shutdown 1. In the Group Policy snap-in, select a Group Policy object to edit. 2. Expand Computer Configuration and Windows Settings, Security Settings, Local Policies, and then expand Security Options. 3. Double-click Shutdown: Clear virtual memory pagefile. 4. Click Enabled, and then click OK.

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EFS is enabled by default but can be disabled for individual files or individual file folders, or they can be disabled entirely for a computer or domain. Disabling EFS for a stand-alone computer requires adding an entry to the registry.

Although files can be made unencryptable by setting the system attribute or placing the file in the %systemroot% folder or any of its subfolders, these options are undesirable in many cases. For example, system files are also normally hidden from view, and a user might want a file that is unencryptable to be visible to other users. Note

Even with Write permission, users cannot encrypt files or folders in the %systemroot% folder, or files or folders that have the system attribute set. Many of these files are needed for the system to start up and decryption keys are not available during the startup process to decrypt them.