Today I was looking for a way to password protect a folder on the Mac. I already familiar with windows machine but I needed to be able to backup a large collection of files onto a USB hard drive and then send it securely through the mail for safe off-site storage on my Mac. For some reason, this functionality is not integrated directly into Finder.
Finally I stumbled upon a way to do it with built-in OS X software. That is perfect because I wanted to avoid using random 3rd-party trial-ware for something that an operating system thought to be able to do for free.
- Open up the “Disk Utility” application
- File -> New -> Disk Image from Folder…
- choose a folder to protect
- choose “AES-128″ encryption and press Save
- Enter your desired new password twice (Do not forget it.)
- This process creates an ordinary Macintosh disk image (.dmg) file. The disk image contains
- the entire contents of the folder, but cannot be opened unless the correct password is supplied. To open it, just double-click the .dmg file in Finder.
- A password dialog box will appear. Once you supply your correct password, Finder will automatically unencrypt your data and mount the image as a disk.
- Done
good
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