Macs don’t need third-party utilities like TrueCrypt to create a secure, encrypted container for your sensitive files. You can create an encrypted disk image using the built-in Disk Utility.

Whenever you want to access your files, you can “mount” the image file and provide your password. Whenever you want to lock access to your files, you can unmount the image file.

Create an Encrypted Disk Image

To get started, you’ll need to open the Disk Utility application. Open a Finder window, click Applications in the sidebar, double-click the Utilities folder, and double-click Disk Utility. You can also just press Command+Space to open Spotlight search, type Disk Utility, and press Return to open it.

Click New Image on the toolbar in the Disk Utility window. This will create a new disk image (.dmg) file. Here are the options you’ll need to configure:

• Save As: Provide a file name for the disk image file. For example, if you name it “MyImage”, the container file will be saved on your hard drive as a file named MyImage.dmg.
• Name: Enter a name for the disk image file. This name is more of a description — it will appear as the name of the container when the file is mounted.
• Size: Choose a size for your disk image file. For example, if you choose 100 MB, you’ll only be able to store up to 100 MB of files inside it. The container file will take up the maximum file size immediately — so, if you choose 100 MB, it will take 100 MB of space on your hard drive even if you have no files saved inside it yet. You can enlarge or shrink the disk image later.
• Format: Select Mac OS Extended (Journaled) as the file system.
• Encryption: Choose either 128-bit or 256-bit AES encryption. 256-bit is more secure, while 128-bit is faster. If you’re encrypting sensitive files, you’ll probably want to choose 256-bit and accept the slight slow-down for more security.
• Partitions: Select Single partition – Apple Partition Map to use a single partition inside your disk image file.
• Image Format: Select read/write disk image so you can read from and write to the disk image at any time.

A disk image (or DMG file) is a file which, when opened, presents itself as a removable Mac OS X volume, similar to a removable hard drive. Many OS X applications are deployed on disk images. If you encrypt your home directory using FileVault, you're creating a spare bundle disk image. Encrypted Dmg File To Ipsw Zaw With High Crit Dmg Low Crit Chance Yosemite Dmg To Usb Windows Linux Sdm.dmg Does Not Exist Mac Os X 10.8 4 Dmg Mac Os X Create Iso From Dmg Centos Convert Dmg To Iso Windows Command Line Dmg To Iso Oxford Advanced Learner's Dictionary Mac Dmg Mac Os X Cannot Install Dmg File.

Click Create and you’ll be prompted to create an encryption password for your disk image. Provide a strong password — this dialog will estimate your password strength to help you with choosing a password. If you lose this password, you’ll lose access to the files inside your encrypted disk image. Be sure to pick something memorable.

You’ll probably want to uncheck the “Remember password in my keychain” option. This option will remember the password in your Mac user account’s keychain so it can be automatically filled in the future.

The disk image will be created, formatted, and automatically mounted for you. You’ll find it on your desktop and in the Finder under Devices. To encrypt files, just save them to this device.

To unmount the encrypted disk image, click the Eject button under Devices in finder or right-click or Ctrl+click its desktop icon and select Eject.

Mount the Encrypted Disk Image

To mount the encrypted disk image in the future, locate its file on your hard drive — it will have the .dmg file extension — and double-click it. You’ll be asked for the encryption password you provided while setting it up.

After you provide the password, you can access the contents of the file just as you would access any other disk image or removable device.

Enlarge or Shrink Your Encrypted Disk Image

If you’re running out of space inside your encrypted disk image and don’t want to create another one, you can enlarge your existing one. Or, if you’re not using the full size of your disk image, you can shrink it to save space on your hard drive. The disk image will take up the maximum amount of space immediately. So, if you enlarge it to 1 GB, it will immediately take up 1 GB of space.

To do this, right-click or Ctrl+click your .dmg file, point to Open With, and select Disk Utility. Select your image file in Disk Utility, click the Resize Image button, and enter a new size for the disk image. You’ll be prompted for your encryption password.

Note that you won’t be able to resize the disk image if it’s currently mounted. If the Resize Image button is grayed out, just click the Eject button in the Disk Utility window.

You can now do whatever you like with your encrypted .dmg file. Keep it on your hard drive, copy it to a USB drive, or even store it online using a cloud file storage service like Dropbox. People won’t be able to access its contents unless they have the password you provided. You can mount the encrypted file on any Mac as long as you have the password.

Copyright: Howtogeek.com

Overview

The Disk Copy or Disk Utility feature for macOS can be used to create an encrypted disk image. Encryption means it requires a password to open or become available (to 'mount'). An encrypted disk image acts as secure storage space and can be used like any other disk image file. It may be copied to or created on network volumes or removable media, including Zip drives, USB flash media, or FireWire hard drives. Each encrypted disk image is protected by a password. The following document explains how to create, mount, and unmount an encrypted disk image.
Important: If you forget the password to your encrypted disk image, the data on that disk image cannot be recovered.

Create Encrypted Dmg File Machine

Getting Started

Files can be moved to or from an encrypted disk image as easily as you can from a non-encrypted disk image. Please be aware of the following when using an encrypted disk image:

Create Encrypted Dmg File Mac Shortcut

• Backup programs will need to back up the entire image if any files within it have changed, since the image appears as a single file.
• There is no way to change the password on an image file.
• An encrypted disk image cannot be used as your home directory.

Complete the following steps to create an encrypted disk image for your version of macOS v. 10.4 or greater.

MacOS

1. Click Go, Applications, Utilities, and then click to open Disk Utility.
   Note: You can also click the New Image button and go to Creating a New Blank Image section.
2. Choose File, then New, then Blank Disk Image.
   
3. A New BlankImage window will display.
   
4. Enter a name in the Save As field. This name is used for the disk image (.dmg) file.
   
5. Enter a name in the Name field. This name displays when the disk image file is opened (mounted).
   
6. Select the Size of the image file from the drop-down menu.
   
7. Choose the Encryption option 128-bit AES to encrypt the image.
   
8. Select the volume Image Format from the drop-down menu. The default “read/write” option is recommended. Click the Create button.
   
9. Enter and verify a secure password when prompted and click OK.
   Note: Ensure the box next to Remember password (add to keychain) is unchecked. This ensures that no one will be able to determine the password for your encrypted drive by checking your keychain.

Cached

Mounting and Unmounting Encrypted Disk Images

How To Create An Encrypted Disk Image Using Mac's Disk Utility

1. After the encrypted disk image has been created, it will automatically mount for the first time and files can be copied to this location. The named volume disk image will display above the mounted source file.
   
2. When you are finished using the encrypted disk image, you must unmount the image. Drag its icon to the trash or select the eject button next to its icon in any finder window. In the example below, the encrypted disk image is named “personal.'
   
3. To mount the image again, simply double-click on the disk image you created. In the image below, the disk image is named personal.dmg. You will see it at the top of the list.
   
4. Enter your password when prompted. Click OK. Your disk image should be mounted.
   Note: Always remember to unmount your disk image when you are finished with it.