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Decrypt For Mac

8/12/2021

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Sophos SafeGuard File Encryption for Mac extends the data protection offered by Sophos SafeGuard Enterprise from Windows to the Mac world. It offers file-based encryption on local drives, network shares, removable drives, and in the cloud.

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With SafeGuard File Encryption for Mac, you can safely encrypt and decrypt files and exchange these files with other users on Macs or Windows PCs.

To read files encrypted by SafeGuard Enterprise on mobile devices, use Sophos Secure Workspace for iOS or Android.

Configure encryption rules

In the SafeGuard Management Center, you define rules for file-based encryption in File Encryption policies. In these file encryption policies, you specify the folders that are to be handled by File Encryption, the encryption mode and the key to be used for encryption. This central management guarantees that identical folders and encryption keys are processed on different platforms, see Configuring encryption rules in location-based File Encryption policies.

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Excluded folders

The following folders are excluded from encryption:
  • Folders are excluded, but not their subfolders:
    • <Root>/
    • <Root>/Volumes/
    • <User Profile>/
  • Folders as well as their subfolders are excluded:
    • <Root>/bin/
    • <Root>/sbin/
    • <Root>/usr/
    • <Root>/private/
    • <Root>/dev/
    • <Root>/Applications/
    • <Root>/System/
    • <Root>/Library/
    • <User Profile>/Library/
    • /<Removables>/SGPortable/
    • /<Removables>/System Volume Information/
Decrypt For MacThis means that, for example, an encryption rule for the root of an additional partition (<Root>/Volumes/) has no effect, although it will be shown as a received policy.

An encryption rule on <Root>/abc will have an effect, while an encryption rule on <Root>/private/abc will not.

Reduce administration effort

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  • Keep the number of mount points (or Secured Folders) as low as possible.
  • Deactivate the option Require confirmation before creating a mobile account.

    If you create or use mobile accounts for Mac endpoints, make sure the option Require confirmation before creating a mobile account is deactivated. With the option activated, the user could select Don’t Create. This would result in the creation of an incomplete macOS user, for example a user that does not have a local home directory.

    To deactivate the option, perform the following steps:

    1. Open the System Preferences and click on Users & Groups.
    2. Click the lock icon, then enter your password.
    3. Select the User.
    4. Click Login Options.
    5. Go to Network Account Server and click Edit...
    6. Select the Active Directory Domain.
    7. Click Open Directory Utility...
    8. Click the lock icon, then enter your password and click Modify Configuration.
    9. Select Active Directory and click the edit icon.
    10. Click the arrow next to Show Advanced Options.
    11. Select Create mobile account at login and deselect the option Require confirmation before creating a mobile account.
    12. Click OK.

Limitations

  • Maximum number of Secured Folders (mount points) on a client

    On each macOS client you can have a maximum of 24 Secured Folders (mount points). If more than one user is logged in on a single machine, you need to add up the mount points from all logged-in users. Mac os x el capitan.

  • Searching for files
    • Spotlight

      By default, searching for files in Secured Folders using Spotlight is not possible.

      To turn on Spotlight search, run the following Terminal command: sgfsadmin --enable-spotlight

      To turn off Spotlight search, run the following Terminal command: sgfsadmin --disable-spotlight

      Note Using Spotlight together with Sophos SafeGuard may reduce the search speed.
    • Labeled files

      Searching for labeled files does not work in Secured Folders.

  • Moving encrypted files from Secured Folders

    When you move an encrypted file from a Secured Folder to non-Secured Folder, the file will still be encrypted, but you will not be able to access its content. You need to decrypt it first manually.

    When you open an encrypted file in a Secured Folder and save it in a non-Secured Folder, the file will be decrypted automatically.

  • Permanent version storage is not available in Secured Folders

    For files in Secured Folders, the standard functionality Browse All Versions.. is not available.

  • Sharing Secured Folders

    A Secured Folder cannot be shared over the network.

  • Burning CDs

    It is not possible to burn an encrypted CD.

  • Deleting files

    When deleting files from a Secured Folder (mount point), a message prompts you to confirm the delete process. Deleted files are not moved to the Trash folder and thus cannot be restored.

  • SafeGuard Portable

    SafeGuard Portable is not available for Macs.

  • Use of AirDrop

    Encrypted files can be transferred with AirDrop. Ensure that the target device can handle encrypted files. If it cannot, applications may behave unpredictably.

  • Handoff

    Using Handoff for encrypted files is not supported.

  • Mounting network file shares with autofs

    Network file shares which have a policy applied and are automatically mounted at startup will not be detected by Sophos SafeGuard File Encryption. It is not possible to handle such mount points because the original mount point cannot be replaced.

Mac computers that have the Apple T2 Security Chip integrate security into both software and hardware to provide encrypted-storage capabilities. Data on the built-in, solid-state drive (SSD) is encrypted using a hardware-accelerated AES engine built into the T2 chip. This encryption is performed with 256-bit keys tied to a unique identifier within the T2 chip.

The advanced encryption technology integrated into the T2 chip provides line-speed encryption, but it also means that if the portion of the T2 chip containing your encryption keys becomes damaged, you might need to restore the content of your drive from a backup. This content includes system files, apps, accounts, preferences, music, photos, movies, and documents.

Always back up your content to a secure external drive or other secure backup location so that you can restore it, if necessary. You should also turn on FileVault for additional security, because without FileVault enabled, your encrypted SSDs automatically mount and decrypt when connected to your Mac.

Make a backup

Set up Time Machine or another backup method to regularly back up your Mac to a secure external source.

Files that you store in iCloud Drive, as well as photos and videos that you store in iCloud Photo Library, are automatically uploaded to iCloud. When you use iCloud Photo Library, full-resolution photos and videos are stored on your Mac by default and included in a Time Machine backup. If you choose to optimize iCloud Photo Library on your Mac, the full-resolution originals are not included in a Time Machine backup.

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Turn on FileVault

Though the SSD in computers that have the Apple T2 Security Chip is encrypted, you should turn on FileVault so that your Mac requires a password to decrypt your data.

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To turn on FileVault, follow these steps:

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  1. Choose Apple menu () > System Preferences, then click Security & Privacy.
  2. Click the FileVault tab.
  3. Click , then enter an administrator name and password.
  4. Click Turn On FileVault.