c# barcode generator example Designing Access Control for Enterprise Data in C#.NET

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Designing Access Control for Enterprise Data
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There are many ways in which EFS keys can become unavailable. The keys are stored in the user s profile so that if the profile is deleted or becomes corrupted the EFS keys are lost. Access to the private EFS key is removed when the user password is reset in Win dows XP and Windows Server 2003. The rationale for this is to prevent an administrator or other user with the Reset Password permission from resetting the user s password, logging on as the user, and decrypting the EFS encrypted files. If the user changes her password by using the change password function, access to EFS encrypted files will not be lost. Finally, keys are just data blobs any data stored on the computer can become corrupted.
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If neither of these keys is available or if the keys are corrupted, the file cannot be decrypted. To ensure that the data in encrypted files will not be lost, an organization must either disable EFS or design an EFS recovery process. Several options can be used to design EFS recovery:
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Train users how to back up and safely store EFS keys. If a backup of a key is available, it can be imported into the profile of a user account and used to decrypt the file. Ensure the existence of a file recovery agent or agents.
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By default, the first administrator account to log on in the domain is the recovery agent. By default, on a Windows Server 2003 stand-alone server, there is no default recovery agent. This is also true of Windows XP. If either Windows Server 2003 or Windows XP is joined in a domain, the domain recovery agent will be used. Recovery agent keys must be backed up.
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Design a file recovery process. Self-signed recovery agent certificates can be used, or a PKI/CA solution can be deployed. Deploy key recovery solutions using a public key infrastructure (PKI).
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A Windows Server 2003 Enterprise Server must be used to establish a certifi cate authority (CA). A custom template for EFS must be created and deployed. Key recovery agents must be created.
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2 explores the design of certificate services.
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See Also
Lesson 5
Designing a File Encryption and Decryption Strategy
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Considerations for Using a File Recovery Strategy That Uses Self-Signed Certificates
File recovery is the process of either restoring a backup of the original keys and then continuing to use the files, or using a file recovery agent to decrypt a file and then returning the file to the owner for encryption. Relying on self-signed certificates makes it difficult to ensure EFS file recovery for more than a few users. Consider the following when designing a file recovery strategy that uses self-signed certificates:
Consider users and EFS key backup. Users do not understand the need to back up encryption keys, or they might back up keys and not store them safely. If a backup key is available to an attacker, it can be used to obtain access to the data in encrypted files. There is no centralized way of organizing and storing backup keys. An administrator would have to collect backup files from all users (or make them himself) and provide a secure storage area. It is impractical to manage the storage of thousands of backed-up keys. Consider the file recovery agent keys. The recovery agent keys can also be damaged or lost. File recovery keys also need to be backed up. They also need to be available before files are encrypted. Creating or making available the recovery agent certificate (and thus the public key) after a file is encrypted does not provide a way to recover the file if the user s keys are damaged or lost. Consider the file recovery agent. The default file recovery agent is an admin istrator. Determine whether the administrator is the right person for this responsi bility. In many organizations, sensitive files are encrypted to prevent unauthorized individuals within the organization from reading them. If the administrator is the recovery agent, you must ensure that she is authorized to read the encrypted files, because she will be able to. Consider the storage of backed-up keys. EFS keys are backed up by export ing them to a file. The file should be password-protected and stored safely. What is a safe place Is it safe to allow users to store this data in a place of their choos ing Should a central place be designated How practical is the storage and main tenance of backup keys Consider the password protection of EFS keys. The password is chosen by the user and might be weak. It must be remembered in order to recover the keys. Users might back up the keys and never need them, or not need them until a lot of time has passed. They might not remember the password and thus be unable to install the backed-up keys. They might not trust their memory and therefore write down the password and keep it with the backup keys, thus making the keys available to anyone who can access the disk.
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