How to Encrypt a Folder with Password Protection in OSX Maverick

1. Open up Disk Utility.
2. Then, click on File > New > Disk Image From Folder.
3. Select the folder you want to encrypt, and click Image.
4. Choose ‘read/write’ access to your folder and the level of encryption ’128-bit AES encryption’.
5. Type in any password you desire, uncheck box for ‘Remember password in my keychain’, IF TICKED, it will defeat the whole purpose of encrypting your folder.

follow details instruction:

http://www.hongkiat.com/blog/encrypt-mac-folder/