Easy is better, so using FileVault on a Mac is a good idea as it gives only you full access to everything but requires a password (open System Preferences, click on Security & Privacy, and select FileVault). Is there an easier way? No, but there’s a free way.
It’s All About Permissions
For Mac users who don’t want to encrypt their entire disk drive in FileVault, here’s a free utility that takes a different approach to restricting file and folder access.
It’s called MacFileSafeguard (all one word). Instead of encrypting or compressing files and folders, this utility locks files and folders the old fashioned way.
That makes MacFileSafeguard friendly and simple to use by assigning permissions to read, write, or delete files and folders.
Even better, MacFileSafeguard works from the Mac’s Menubar. Click on the icon to begin protecting files and folders (including contents of subfolders).
Simply click to add a file, app, or folder to the protection list.
Files are never modified or encrypted. The protection is simple and applied only to OS X’s permissions. MacFileSafeguard is a simple and free way to protect files from accidental deletion, or away from snoops and wandering eyes.
Then again, if you have nothing to hide, do you really need any kind of file security?