Security Hole? disk image passwords are cached for a short time!

Here's my experiment:
1. Make a password-protected (128-bit AES) disk image (dmg or sparseimage), and do not save the password in the keychain.
2. Load the image (you'll be prompted for the password).
3. When virtual disk appears, eject it.
4. Repeat steps 2 & 3 rapidly until the disk loads without first prompting for the password.
Once this happens, it will (often) load again even after 10 or 30 seconds (or more?) without a password prompt..
I don't see how this could be happening unless the password accepted by the prompt is saved somewhere.
Why should it be? Where? Is there a bug?
And why should it be saved as long as ten seonds or more after the disk is ejected??
I'm running Mac OS X 10.6.8 on a year-old MacBook Pro

Hi All
I have been following this up for you and would like to confirm that the software specified in the Hub 2.0a is secure against the attack you mention here.
Thx
Kerry
Retired BTCare Community Manager - StephanieG and SeanD are your new Community Managers
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