![]() 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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