Password-protected .dmg file "forgets" it is protected

So, on my external USB hard disk I had created two password-protected ".dmg" disc images. Both functioned normally for about 2 months. Then, suddenly, one of the two images now opens without asking for its password (the other file remains protected). What happened?
I tried ejecting the virtual disc and double-clicking on the .dmg file again, and each time the disc mounted with no password required. I ejected the external hard disk, unplugged the USB connector, replugged it, and the same thing happens.
It looks as though I need to replace this .dmg file with another password-protected one, but how long will that last?
PPC PowerMac 2.7 GHz dual-CPU G5
Mac OS X 10.4.11

Hmmmm, Open Console in Applications>Utilities & see if there are any clues or repeating messages when trying to open Keychain Access.
Maybe this first...
"Try Disk Utility
1. Insert the Mac OS X Install disc, then restart the computer while holding the C key.
2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu at top of the screen. (In Mac OS X 10.4 or later, you must select your language first.)
*Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.*
3. Click the First Aid tab.
4. Select your Mac OS X volume.
5. Click Repair Disk, (not Repair Permissions). Disk Utility checks and repairs the disk."
http://docs.info.apple.com/article.html?artnum=106214
Then try a Safe Boot, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, reboot when it completes.
(Safe boot may stay on the gray radian for a long time, let it go, it's trying to repair the Hard Drive & clear caches.)
If perchance you can't find your install Disc, at least try it from the Safe Boot part onward.

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