print barcode in asp.net c# $ chmod 700 /Volumes/mySecureData in Objective-C

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After running this command, only the mounting user will have access to the data. While for the most part this will work out, it is possible to further secure the data on a mounted volume by passing custom mount parameters to hdiutil when mounting an image. Through the use of owners option, it is possible to force a disk image to mount in a manner that enforces permissions as laid down on the image volume. On top of this, you can specify a custom mountpoint, other than /Volumes, for the mounting of your volume. Lastly, we can use the nobrowse option to prevent the volume from being recognized as such by the Finder: instead it will treated just like any other folder on the system, and will prevent the volume from showing up in other user s devices list. To mount an image with such options, utilize the following syntax:
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$mkdir ~/SecureData $ hdiutil attach -owners on -nobrowse -mountpoint ~/SecureData ~/Desktop/mySecureData.sparseimage
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After executing this command, the volume found in the mySecureData sparse image will be mounted to a folder named SecureData at the root of the user s home directory. You ll notice here that we are using the mkdir command to first create the directory prior to running the hdiutil command: if the designated mountpoint does not exist, then the
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CHAPTER 9: Encrypting Files and Volumes
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mount operation will fail. Because we are passing the owners flag with a value of on,| we are ensuring that any ownership on the volume is preserved, which allows you to utilize normal file system permissions to secure data on mounted volumes. For more information on utilizing file system permissions, refer to 4. To unmount or detach the image, we simply use the detach verb and pass it the volume path:
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$ hdiutil detach /Volumes/mySecureData "disk3" unmounted. "disk3" ejected.
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Alternatively we can provide the disk path:
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$ hdiutil detach /dev/disk3 "disk3" unmounted. "disk3" ejected.
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As can be seen, with either syntax the device disk3 is ejected from the system. Creation of disk images requires a bit more lengthy syntax, and is achieved by using the create verb. The process allows for the specification of all parameters that we were presented from the GUI and more:
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$ hdiutil create -size 100M -fs "Journaled HFS+" -volname "myImage" ~/Desktop/myImage.dmg created: /Users/hunterbj/myImage.dmg
In this case, a 100MB image file named myImage.dmg is created on the desktop. The volume name of the image is specified by the -volname parameter, in this case testImage. By default, the format of the image file is Read/Write, a GUID partition scheme is used, and no encryption is used on the disk image. To create a sparse image with encryption we can use the following syntax:
$ hdiutil create -size 8G -fs "Journaled HFS+" -volname "myImage" -type SPARSE -encryption AES-128 ~/Desktop/mySecureImage.sparseimage Enter a new password to secure "mySecureImage.sparseimage": Re-enter new password: created: /Users/hunterbj/mySecureImage.sparseimage
Here, we were prompted for a password to use for encryption. We can also use the stdinpass if we want to specify the password programmatically:
$ echo -n 'myPassword1$' | hdiutil create -size 8G -fs "Journaled HFS+" -volname "myImage" -type SPARSE -encryption AES-128 -stdinpass ~/Desktop/mySecureImage.sparseimage created: /Users/hunterbj/mySecureImage.sparseimage
In both of these cases, we re encrypting the image with AES-128 bit encryption. In the first example we had to interactively enter our password; in the second example, we re passing a password of myPassword1$ via the echo command (the -n prevents echo from sending a trailing newline after the password), which is then read in as the password to use to encrypt the image. This is very handy in cases where you have to programmatically generate images for end users, and have a default password template or routine that should be used on new images. This password can then be changed on
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