Uh, Archive works, but only if you want to dig into the Mac’s Terminal.app and know the exact command line string to use. OS X’s built-in Disk Utility does the deed, too, but isn’t exactly an intuitive process. Actually, the easiest way is almost free.
Encrypt And Lock
Among the many and varied ways to zip up and archive a file or folder of files or a bunch of files is one that caught my eye because of three basic factors.
First of all, DriveLock File Protection is free. Secondly, it uses AES-256 bit encryption to secure files from view.
Finally, it’s easy to use and works from within the Mac’s Finder with the familiar drag and drop routine.
In fact, that’s about it.
Grab the files you want to hide, drag and drop them onto DriveLock File Protection, add a password, user name, select and encryption algorithm and a password hash algorithm, and click the Create Encrypted Folder button.
DriveLock File Protection is available for Mac, Windows, iOS devices and it’s easy to setup and use, and, well, what’s the catch?
It’s free to use up to files of 2GB in size; probably fine for light local use, but less than ideal for small or large businesses or organizations with more critical file storage and encryption needs. Any files beyond 2GB require the Private or Business version which is an annual license.