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

Generator DataMatrix in Objective-C 9: Encrypting Files and Volumes

CHAPTER 9: Encrypting Files and Volumes
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utilize their own password for the disk image, even changing them, and will never need access to our private key. If the end user leaves or forgets the password, we can simply recover it using our own closely guarded private key. CAUTION: By granting a single identity access to all disk images, it becomes absolutely imperative that the certificate s private key be closely guarded at all times. If this key is compromised, so too are all images created with its certificate. To create a disk image that utilizes both a password and a certificate for authentication, we simply add an additional option, -agentpass, to our previous command. When the agentpass flag is specified, hdiutil will prompt for an interactive password:
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$ hdiutil create -size 8G -fs "Journaled HFS+" -volname "myImage" -type SPARSE -encryption AES-256 -certificate ~/Desktop/MyCo\ Disk\ Encryption\ Identity.cer -agentpass ~/Desktop/mySecureImage.sparseimage Enter a new password to secure "mySecureImage.sparseimage": Re-enter new password: created: /Users/hunterbj/Desktop/mySecureImage.sparseimage
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If the image is being made programmatically, then the stdinpass flag can be used to read data in from standard input:
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$ echo -n 'myPassword1$' | hdiutil create -size 8G -fs "Journaled HFS+" -volname "myImage" -type SPARSE -encryption AES-256 -certificate ~/Desktop/MyCo\ Disk\ Encryption\ Identity.cer -stdinpass ~/Desktop/mySecureImage.sparseimage created: /Users/hunterbj/Desktop/mySecureImage.sparseimage
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From here on, whenever the image is mounted, disk utility will first search through all of a user s keychains for the corresponding private key; if it is not found, the user will be prompted to enter a password. If you need to mount the image from a machine that doesn t have an active console, you can specify the path to the keychain using hdiutil:
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$ hdiutil attach -recover /Library/Keychains/MyCo\ Disk\ Encryption.keychain ~/Desktop/mySecureImage.sparseimage /dev/disk1 /dev/disk1s1 /dev/disk1s2 GUID_partition_scheme EFI Apple_HFS
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/Volumes/myImage
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In this example, we utilize the -recover option and specify the path to a keychain file that contains the appropriate identity. In this case, we are referencing a keychain that was made specifically for this purpose, MyCo Disk Encryption.keychain stored in the global library. This keychain contains solely the certificate/key pair that makes up the MyCo Disk Encryption Identity that we previously made. By creating a unique keychain for this, we can specify a very strong passphrase for this keychain and store it in a secure place. In the event that data recover is needed due to a lost password, the keychain can be imported on the administrators machine and facilitate access to the data.
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CHAPTER 9: Encrypting Files and Volumes
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TIP: Or, the identity can be stored in a standard password-protected PKCS#12 container, which can be directly exported from Keychain Access, and then re-imported when needed. Thus far, we ve demonstrated how to create sparse images using hdiutil create and passing the format option a value of SPARSE. However, there are a number of other formats that are worth knowing about, and each requires a specific identifier to be passed to the format flag. Table 9 1 illustrates the available formats.
Table 9 1. New Image Formats Used with diskutil create
Format
UDIF UDTO SPARSE
Comment
This is a standard read/write fixed-size disk image. This is format is the equivalent of DVD/CD Master in the Disk Utility GUI. A sparse disk image.
SPARSEBUNDLE A sparse bundle disk image.
These options may be very familiar, and for good reason: the list is identical to the options presented in the Disk Utility GUI. However, there are a few additional properties that can be specified from the command line when dealing with sparse bundle images that are worth noting. As mentioned, a sparsebundle image is actually comprised of numerous separate files, or bands, which comprise the entire volume. By default, each band in a sparse bundle image is 8MB. Apple likely chose this default size because it is a good compromise between small and large file access. The truth of the matter is that one size doesn t necessarily fit all, and for some data sets, a small band size can adversely affect performance. This is especially true in large data sets. Consider a 500GB sparse bundle image; in such a scenario, the sparse bundle would actually contain over 60,000 bands! For instance, a backup system could process and protect 15,000 32MB bands much faster than it could process 60,000 8MB bands. Another situation where a smaller band size can adversely performance is if you plan to store larger files on your image volume. If you plan to routinely store files that are in excess of 8MB, then can be adversely affected due to the extra overhead needed for the additional I/O operations. Even though you are only accessing a single file on the image volume, the underlying file system will have to open up the individual bands that store that segment of the file. For instance, a 128MB video, just a few minutes of HD, will actually require 16 file requests. That s a fair amount of overhead, so the user may benefit from a larger band size. To create a sparse bundle with a custom band size, you use the -imagekey flag, which accepts key value pairs. For instance, to create a sparsebundle image that utilizes 32MB bands, we can use the following syntax:
$ hdiutil create -size 8g -type SPARSEBUNDLE -imagekey sparse-band-size=65536 -fs "JHFS+" -volname "myImage" ~/Desktop/myImage.sparsebundle
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