Now you have a secure container in which you can drag anything you like.
#Mac os x encryption password
The decrypted volume will mount, and you can access the original files.ĭo 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. You'll be promoted for the passcode you entered in step #4 above. To access the now encrypted data, double click your DMG file. (Don't forget to delete the originals.) Now your data is (fairly) safe.Ħ. You can drag the files you want encrypted into this volume, then unmount it. On your desktop you'll see your encrypted DMG file and also the mounted volume that you named above. After you select a volume size, you can leave the rest of the items as the default.ĥ. Make it at least 12 characters and don't forget it. As soon as you select the encryption method, AES-256, you'll be prompted for the passcode. They can be the same, but make them different to easily, visually differentiate them.Ĥ. The third field, "Name" is the name of the volume that will mount. The first field, "Save As:" will be the name of the DMG file. You'll see and popup with fields to fill out. Go to the app's File Menu and select New Image > Blank Image.ģ. The example here uses the version found in OS X 10.11 El Capitan.Ģ. The OS X utility you'll use is /Applications/Utilities/Disk Utility.app.
In this case, we'll encrypt the contents of a DMG file and set a passcode to decrypt it. You've likely seen DMG files before because they're handy ways to distribute software. It uses AES-256 encryption, which is considered fairly strong encryption. A "DMG" file, short for "disk image," can be used as a container to store one or more files if desired. For those who want to go further and expand their knowledge, I'll list some resources at the end of this How-to. In this article, we'll keep it short and sweet for beginners so that it's easily understandable for a specific, simple task. Encryption is a vast and complex subject. I'll show you the two native methods available in OS X. Unfortunately, OS X itself doesn't have many built-in ways to encrypt a file. There are many tools for encrypting files in OS X.
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