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

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

CHAPTER 9: Encrypting Files and Volumes
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mounted, it is presented on the local file system as another disk. The problem with this is that if the systems runtime is compromised, then referencing the filesystem path at which the image is mounted can access the unencrypted data. This means that if the user is subjected to malware such that a foreign program is executed in his environment, then that malicious program will be able to be accessed by that program. Thus, if an encrypted disk image is opened on a compromised system, it can be assumed that the data on the mounted volume will be detected and read; confidentiality of the encrypted data will be breached. Considering this aspect of utilizing disk images for encryption, it is a good practice to get in the habit of only having secure volumes mounted explicitly when needed: mounting an encrypted disk image opens a window to the data, keeping that window closed as much as possible is key to keeping the data safe; keeping an encrypted disk image mounted at all times may expose data unnecessarily.
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Interfacing with Disk Images from the Command Line
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Thus far, we have demonstrated the process for creating encrypted disk images using the Disk Utility GUI application. In some cases, it may be desirable to automate the process. For instance, as an administrator, you may wish to create an encrypted disk image for the purposes of backup. Or, you may be looking to mass-deploy encrypted disk images to a multitude of users. In cases such as this, using Disk Utility to interactively create a disk image might not be the most efficient use of time. Interactive creation of disk images will severely hamper your ability to automate backups that would utilize them. Economies of scale apply to large user environments inhibiting the practicality of manually creating an encrypted disk image for each of your users. Luckily, Mac OS X offers a very capable command line suite for creating and manipulating disk images. The primary utility for dealing with disk images from the command line is the hdiutil command. This command can be used to create, mount (attach), and unmount (detach) image files, among other things. Mounting and un-mounting disk images is rather trivial to accomplish with this tool. To do so, we just call hdiutil with the attach verb, and then pass in the path to our disk image file. The command and subsequent output are shown here:
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$ hdiutil attach ~/Desktop/mySecureData.sparseimage Enter password to access "mySecureData.sparseimage": /dev/disk3 Apple_partition_scheme /dev/disk3s1 Apple_partition_map /dev/disk3s2 Apple_HFS /Volumes/mySecureData
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As can be seen by the output, the user is prompted for a password, the image file mySecureData.sparseimage is assigned device of /dev/disk3, and is mounted at path /Volumes/mySecureData.
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CHAPTER 9: Encrypting Files and Volumes
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NOTE: If you want to automate the mounting of an encrypted disk image for backups, you will need to automate the supply of the password, too, which means that the password is going to be sitting somewhere in cleartext for your script to grab. In the case of an ObjectiveC application, it is possible to utilize the keychain framework to store this value, but even then, the keychain must be unlocked at the time of use. Once mounted, the encrypted disk image behaves just like another physical drive in the system. There are a few things to note about this. First and foremost, as stated, when an image file is attached, any POSIX permissions laid down on the volume will be effectively bypassed, due to the fact that ownership of all items on the disk image s volume is masked to the running user. On top of this, the volume is mounted to the typical OS X directory in /Volumes. This can create a security issue on nodes that have more than a single logged in user: if you mount your disk image on a computer with another active user session, they will not only be able to see that the disk was attached, but they will also be able to navigate to the volume and likely read data off of that volume. Remember from 4 that a user s default umask setting in OS X is set such that any newly created files have global read access. As such, concurrent user sessions will likely have access to the unencrypted data, which isn t good. To avoid this issue, there are a couple of options. The first is to simply ensure that the top level of the disk image volume has adequate protections. While ownership is not respected by default with disk images, the mode is. This means that, if a directory only has read and execute permissions granted at the ownership level, other users will not be able to view any data on the volume. To accomplish this, a user can simply remove all access from other users by using the Permissions tab of a Finder Get Info window. Or, you can use the chmod command as shown here:
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