There are many tools for encrypting files in OS X. GUI apps to do that have varying prices. Unfortunately, OS X itself doesn't have many built-in ways to encrypt a file. I'll show you the two native methods available in OS X.
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Does anyone know of a tool that will supports encrypted.dmg (OSX disk image) files under Windows? Stack Exchange Network Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Apr 03, 2018 This 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. Name: Provide a name for the disk image file. This name is more of a description—it appears as the name of the container when the file is mounted. Size: Choose a size for your disk image file.
Introduction. Encryption is a vast and complex subject. There are many nuances and gotchas. In this article, we'll keep it short and sweet for beginners so that it's easily understandable for a specific, simple task. For those who want to go further and expand their knowledge, I'll list some resources at the end of this How-to.
Method #1. Encrypted DMG. A 'DMG' file, short for 'disk image,' can be used as a container to store one or more files if desired. It uses AES-256 encryption, which is considered fairly strong encryption.
You've likely seen DMG files before because they're handy ways to distribute software. In this case, we'll encrypt the contents of a DMG file and set a passcode to decrypt it.
![Dmg decrypt mac Dmg decrypt mac](/uploads/1/3/4/3/134367706/489439313.png)
The OS X utility you'll use is /Applications/Utilities/Disk Utility.app. The example here uses the version found in OS X 10.11 El Capitan.
1. Launch Disk Utility.app.
2. Go to the app's File Menu and select New Image > Blank Image.
The Disk Utility File menu.3. You'll see and popup with fields to fill out. The first field, 'Save As:' will be the name of the DMG file. The third field, 'Name' is the name of the volume that will mount. They can be the same, but make them different to easily, visually differentiate them.
4. As soon as you select the encryption method, AES-256, you'll be prompted for the passcode. Make it at least 12 characters and don't forget it. After you select a volume size, you can leave the rest of the items as the default.
5. Click save. On your desktop you'll see your encrypted DMG file and also the mounted volume that you named above. You can drag the files you want encrypted into this volume, then unmount it. (Don't forget to delete the originals.) Now your data is (fairly) safe.
Your encrypted DMG file looks like this.6. To access the now encrypted data, double click your DMG file. You'll be promoted for the passcode you entered in step #4 above. The decrypted volume will mount, and you can access the original files.
Do NOT check the box to save the password in the Keychain else anyone who has access to your Mac can easily decrypt your DMG with a double-click.
Now you have a secure container in which you can drag anything you like. Just remember that when you drag sensitive files, across volumes, into the container to delete the originals and select 'Secure Empty Trash.' However if you're using an SSD and/or El Capitan, read this article first. 'How to replace El Capitan's missing Secure Empty Trash.'
Next page: You knew it was coming. A command line technique.
![Dmg Dmg](/uploads/1/3/4/3/134367706/415522263.jpg)
Page 2 - Method #2, the UNIX Command Line
Method #2. SSL Encryption on the command line. OS X has within its UNIX core the facility to encrypt individual files. You can do this on the command line with the 'openssl' command. For more details, including the nuance of the alternate method to encrypt for email transmission, this tutorial on SSL. We're going to encrypt a text file. The method I show here also uses AES-256 encryption.
1. Encrypt. Open the terminal command and navigate to the file to be encrypted. I'll assume you know how to use the UNIX 'cd' command to navigate to it. Let's call it secret.txt. Enter this on the command line.
You'll be prompted to enter the passcode and then verify it. The original file will automatically be deleted and the output encrypted file is named 'secret.enc'. My encrypted text file looks like this:
2. Decrypt. Again, on the command line, navigate to the encrypted file and enter:
You'll be promoted for the passcode. The decrypted text file will be written to the file after the '>' symbol, and the original encrypted file will be retained.
This second method is a bit geeky, but after some experimenting with some dummy test data, you should get the hang of it. Of course, if you wanted to get really geeky, you could wrap the above commands in a shell script with user inputs, but that's way beyond the scope of this article.
Final Note: There is a similar technique that uses the zip command on the command line. Utilities like Cocoatech's Path Finder wrap a GUI around it. However, for backwards compatibility, so far as I know, the OS X implementation of the zip encryption remains very weak and should not be used. OpenSSL is your best, more secure method.
Further Reading
1. Why we use the -salt option above.
2. Details on the OpenSSL Command
3. AES Encryption Standard
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None of the versions of Windows operating system supports DMG format out of the box. As you likely know, DMG file is an OS X disk image file and are supported in Mac OS X operating system. One needs to take the help of third-party tools in order to open a DMG file on a PC running Windows operating system.
Those of you have spent considerable amount of time on Mac would know that the DMG is mostly used to install apps on Mac. In other words, apps that we download to install on a Mac OS X use .DMG extension and can be mounted easily by double-clicking on the file on Mac.
While there are a couple of handy options out there to open or extract a DMG file in Windows, we will share the best three tools to deal with DMG files in Windows environment.
DMG Extractor
DMG Extractor is probably the first and only tool designed exclusively to deal with DMG files on Windows OS. Since DMG Extractor is developed specially for DMG files, it can open encrypted .DMG files without having to first convert them to other formats.
Raw, Bzip2, Zlib, and Zero block type DMG files are supported by DMG Extractor.
The only catch with the free version of DMG Extractor is that it can’t open DMG file of size more than 4GB but that shouldn’t be problem for most users.
Using DMG Extractor is fairly simple. After installing the software, right-click on the DMG file that you want to open and then click Open option to open the file with DMG Extractor. Alternatively, after launching DMG Extractor, click Open button and then select the DMG file to contents of the selected DMG file.
To extract a DMG file, click the Extract button and then select a location to save the contents.
HFSExplorer
Another free utility that you can install on your Windows machine to extract DMG files is HFS+ Explorer. With HFSExplorer you can open Mac-formatted disks and disk images in Windows.
While HFSExplorer is relatively easy-to-use, we must mention that it’s not as straight-forward as DMG Extractor. You need to install Java SE Runtime Environment 5.0 or above in order to run HFSExplorer and it doesn’t support all type of DMG format, including DMG UDF format.
However, on the plus side, there is no size restriction per file.
Here is how to use HFSExplorer to open DMG files
Step 1: Download and install Java SE Runtime Environment 5.0 or greater version.
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Step 2: Visit this page to download HFSExplorer and run the installer to get it installed.
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Step 3: Run HFSExplorer, click File menu, and click Load file system from path option to browse to the DMF file.
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If you have come across a better solution to open DMG files in Windows, dos share with us in comments.
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7-Zip Free
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Most PC users are familiar with 7-Zip utility. If you haven’t used 7-Zip before this, it’s a free tool used to compress and uncompressed files. In addition to 7z, Zip, and RAR formats, 7-Zip also supports DMG format. However, it’s important to note that 7-Zip supports only unpacking of DMG files.