print barcode in asp.net c# 9: Encrypting Files and Volumes in Objective-C

Encoding Data Matrix 2d barcode in Objective-C 9: Encrypting Files and Volumes

CHAPTER 9: Encrypting Files and Volumes
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the system. If every machine has the same FileVault identity, then administrators need only maintain a single identity to unlock all user data across the fleet. Alternatively a number of identities can be maintained based on company logistics to mitigate the impact should the identity be compromised. Deploying the centralized identity isn t a terribly difficult task. To accomplish this, all an administrator needs to do is to set a master password on the base image used for deployment. Alternatively, the FileVaultMaster.cer and FileVaultMaster.keychain files, found at /Library/Keychain, can be copied off of a designated machine that has had a master password set to a secure value, and then a package installer can be created for these two files and deployed. By deploying these two files to all machines in the fleet, any newly created FileVault encrypted images, regardless of the machine, will have a the common backdoor. In the event that an administrator seeks to rotate the master password, they can simply update the password used to protect the FileVaultMaster.keychain, and redeploy the keychain file with the new password to all of the machines. Because the underlying certificate and private key remains intact and unaltered, the existing FileVaultMaster.keychain can simply be overwritten by the new file. This is a very important measure to take when deploying FileVault across your organization. If you depend on the FileVaultMaster.keychain that is enabled by each individual client, management will become an arduous task, as you will need to ensure that you have access to every single machine s individual keychain, which can easily turn into a nightmare. By deploying a consistent keychain across all clients, you ensure that you have a single identity that can unlock all encrypted data across your fleet, short of individual user s keychains, for reasons discussed in the previous section. NOTE: Because a certificate backdoor is applied to a FileVault encrypted image at creation time, it is imperative that you deploy the global FileVaultMaster.keychain to a machine prior to any users having FileVault enabled on the machine. If a user has FileVault enabled prior to deploying the global keychain, if you overwrite the existing auto-generated FileVaultMaster.keychain on the client, any previously existing FileVault images will not have a backdoor access capability.
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Limitations of Sparse Images and Reclaiming Space
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There are some ramifications that come with using sparse images, whether file-based or bundle based, and while this discussion might belong in the previous section, these considerations are more prescient when sparse images are used in a FileVault environment, mainly due to the larger data sets that are involved when the entirety of a user s home folder is placed onto a sparse image file. We mentioned in the previous section that one benefit to using sparse images and bundle images is that, outside of minimal formatting information, they only occupy as much disk space as the data that is present on the volume. This actually is not 100% accurate. You see, as you add data to a sparse volume, the image file or bundle will grow as needed. The problem is that once the data is allocated to the image, it will remain allocated, even if the underlying data is deleted off of the image s volume. Thus, if you download a 2GB file to your desktop,
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CHAPTER 9: Encrypting Files and Volumes
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your sparse bundle will grow accordingly and occupy an additional 2GB on disk. When you remove that 2GB file, the disk image still occupies that additional space, and doesn t shrink at as one might at first expect. This has important ramifications for a user home directory, especially if they begin to run out of drive space. Common user perception is that in such a case, you simply remove files and your hard drive reclaims that space. Well, with FileVault enabled (and sparse images in general), that is not the case. To get around this, when a user logs out of their account and there is a large amount of such unnecessary waste, FileVault will automatically reclaim any missing space, in the process presenting the user with a dialog box, shown in Figure 9 14. During this operation, the sparse image will be compacted such that the image file will occupy only as much space as the data it contains. As it was in the beginning, it will again be.
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