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An encrypted file contains encrypted data and a header with fields to store copies of the encrypted FEK for authorized users and designated data recovery agents (DRA). For more information about DRAs, see Data Recovery and Data Recovery Agents later in this chapter. The structure for an encrypted file is shown in Figure 18-2.

the text of the message in the bottom text box, and click Send to send it (or just press Enter). Notice that you can also change the font of the message. Your message now appears in the upper text pane.

A DDF exists for each authorized user File Header File Encryption Key Encrypted with the public key of designated recovery agent 1 File Encryption Key Encrypted with the public key of designated recovery agent 2 Data Recovery Fields

Encrypted Data "*(d3ca&&1/!p94882aAA"

Figure 18-2

The message is sent to the contact. If the contact begins responding to your message, you ll see a notification in the Conversation window status bar telling you that the contact is typing a message. When the contact sends it by clicking Send or pressing Enter, the message appears in the upper pane directly beneath your message. This feature allows you to see the conversation thread and scroll it back and forth to review it as needed.

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Data decryption field An encrypted file contains a minimum of one stored FEK, the FEK encrypted by using the initial encryptor s public key. The storage field for this encrypted FEK is called the data decryption field (DDF). Additionally, if an EFS-encrypted file is shared, a copy of the FEK is encrypted by using the newly authorized user s public key, and the encrypted FEK is stored in another DDF. For more information about sharing encrypted files, see Authorizing Multiuser Access to Encrypted Files later in this chapter. Data Recovery Field If a computer s effective security policy designates one or more data recovery agent (DRA), copies of the FEK are encrypted for each DRA using each DRA s public key and stored in another file header field called the data recovery field (DRF).

The first dialog box you ll add is an About dialog box, which exists in most Windows applications. This dialog box contains essentially the same information as the splash screen but sometimes contains more legal, system, and version information.

When a user encrypts an existing file, the following process occurs: 1. The EFS service opens the file for exclusive access. 2. All data streams in the file are copied to a plaintext temporary file in the system s temporary directory. 3. An FEK is randomly generated and used to encrypt the file by using DESX or 3DES, depending on the effective security policy. 4. A DDF is created to contain the FEK encrypted by using the user s public key. EFS automatically obtains the user s public key from the user s X.509 version 3 file encryption certificate. 5. If a recovery agent has been designated through Group Policy, a DRF is created to contain the FEK encrypted by using RSA and the recovery agent s public key. For more information about using Group Policy to configure data recovery agents, see Configuring Data Recovery Policy in a Stand-Alone Environment later in this chapter. EFS automatically obtains the recovery agent s public key for file recovery from the recovery agent s X.509 version 3 certificate, which is stored in the EFS recovery policy. If there are multiple recovery agents, a copy of the FEK is encrypted by using each agent s public key, and a DRF is created to store each encrypted FEK. Note

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The file recovery property in the certificate is an example of an enhanced key usage (EKU) field. An EKU extension and extended property specify and limit the valid uses of a certificate. File Recovery is one of the EKU fields defined by Microsoft as part of the Microsoft public key infrastructure (PKI).

Part III: