A few years ago I created a 100MB disk image using Disk Utility in which to store my sensitive files. I've hit the limit, and so I created a new one that is 500MB. I was sure to select the encryption option and to set a password. However, this new one is not requiring my password to open it! When I double click on the disk image, the image mounts without a password prompt. I've tried this multiple times on different settings, logged out and in, etc., and I still can't get it to work. What's wrong? ---------- Hm. Figured it out. The OS had saved my password in Keychain.