Can I Password protect folders?

I have some "pictures" in my macbook I dont want anyone to see, I sometimes use my computer at work and I dont want one of my co workers lurking around my machine if I forget to lock the screen one day.

is there a way to password protect a folder?


TIA

Here is a quick and easy way to do it...

Use Disk Utility (in Applications:Utilities).
Just click on the New Image icon and choose where you want it, select the size you'd like, set encryption to AES-128, leave the format at read/write, click create, and enter the password. Then put your files/folders in the image. When your done, eject the image. From that point on, opening it will require the password.

Edit: There is NO back door, so don't lose the password.