[Scott_R]

I'm using Disk Utility to create an encrypted disk image from a folder (FIle>New>Disk Image from Folder), selecting 128-bit encryption; I use a long passphrase with mixed upper- and lowercase and letters and numbers. For Image Format I've tried both "compressed" and "read/write."

The problem is that once the disk image is created, it mounts without asking for a password, as if it wasn't encrypted at all.

Any ideas what's going on?

[P]

Can it be that the Keychain is storing the password? What happens if you log in as another user and try to open the image?

[WizOSX]

When you encrypt the file there is a check box which is checked--"save password in keychain." So if you don't uncheck that box, it will open automatically.