Don not need any applications, we actually can set very highly secure password for a Folder in Mac OS X to protect your data from the others. Look at our following tip to be able to generate Folder Password in Mac OS X.
Hiding folder is a simple way to protect your Data somehow. Take a look at How to hide Folder and view hidden files in Mac OS X El Capitan.
Apple provides Mac OS X with a feature that can encrypt a folder to a new disk image. The encrypted Folders will be protected totally by secured password. If you do not want anyone to arbitrarily see your data, use DISK UTILITY to protect them with your own password.
Folder Password in Mac OS X
1. Launch Disk Utility and choose Disk Image from Folder.
2. Locate and choose the Folder you want to protect by password then click on image button.
3. Next step, we would recommend to set things as same as the following picture:
4. Provide your own secure password to protect the Folder.
5. The process.
6. The results: