Disk Image Password

Hi, I created an encrypted disk image and assigned it a password. Everything was fine for months; If I wanted to mount the disk image I would be asked for the password. That is what I wanted.
I was making up an Appleworks 6 data base last week and the computer started to ask me repetitively for the password to open the disk image, altho the disk image had nothing to do with the data base I was making. After awhile, frustrated with the constant window, I added the password and said "remember it". Well it went away and stopped bugging me. I have no idea why the window kept popping up during the data base work.
In any case; my problem:
The disk image now mounts without any request for a password. I cannot figure out how to get it back to asking for a password before mounting the disk image.
I have looked into keychain, Safari automount and the disk utility application; to no avail.
Short of killing the disk image and recdreating it from scratch, is there a way to bring back the permission window before mounting the disk image?
Thanks, John

The answer is to deselect "remember password (add to keychain)" when you create the New Image
Make sure you remember the password though

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Disk Image Passwords

Is there anyway to change a disk image password on your desktop?

If you are referring to the password on a secure disk image (a dmg file that mounts as a disk after you open it and enter the password), then no, there is no way to change the password. Assuming you know the password, what you need to do is create a new secure disk image (in Disk Utility) with the new desired password, then copy the contents of the old disk image to the new disk image.
If you do not know the password of the current disk image (the one you want to change) and did not store it in the keychain, then there is *_no way_* you can get at those encrypted data (which is the point of the encryption of the data!). In OS X 10.4, Disk Utility uses 128-bit AES encryption.
Note that if you stored the password in your keychain, you can see the password - launch Applications > Utilities > Keychain Access, click on Passwords, double-click the "diskimage".dmg item, then check the Show Password box (you'll have to enter your login password and click Allow Once). Even though you can "edit" the password in that field, and the edit will stick, that will not change the password of the disk image (but it will 'break' the keychain item, such that if the disk mounted automatically because the password was stored in the keychain, it won't do that anymore and the password will have to be entered to mount the disk image).
Hope this helps...

Why does screen saver prompt for secure disk image password?

Okay, seems like an odd problem, but here it goes.
I go into System Preferences->Dektop & Screen Saver. As the program "loads" availabe image sources and such I get a pop-up requesting a password to my secure disk image.
Yes, I have a secure disk image in my home directory.
Yes, the secure disk image is currently "locked" (Not mounted in finder).
I click cancel (a few times, probably 2 maybe 3 times) and things continue along fine.
I select a photo source that I want for a screen save and exit peferences.
I then go an start the screen saver (I'm using Hot-Corners).
I get the message "Looking for pictures....." for , well...basically forever...
Sure enough I touch the mouse to leave my screen saver and there is the pop-up again. Asking for me to unlock my secure
disk image.
I thought this might be related to Spotlight. I tried reading several threads and have gone as far as taking my entire hard-drive/volume
and putting it into the "Privacy" tab under spotlight.
Anybody have any idea on what is going on and how I might get it so the "Desktop & Screen Saver" stop prompting me to unlock my
secure disk image? (WITHOUT having to make sure the disk image is unlocked before I sleep my screen or open the screen saver utlity)
As always, I am only speculating that this is Spotlight related so that could be a red-herring....
thanks in advance.
OSX:10.7.3
imac/3.1G/Intel

Update: i made some progress on this issue. I found that in the ~/picture/iPhot Library/Database/ directory
there is a file called Library.apdb. This file has an entry for the secure disk image i have/had. I moved the file
to Libraryapdb.bkup and sure enough, my picture problem went away. The screen aaver panel no longer prompts
me to unlock my secure disk image.
So now the next chapter of my problem;when i open up iPhoto it wants to rebuild my photo library(which makes
sense and is what i want to haopen) so i allow it. After about 25 mins it has rebuilt the iPhoto library, but there is
one problem. The secure diskimage reference is back in the Library.apdb file that has been recreated!
So now i need to figure outnhow to get iPhoto to remove anynreference to a phot library i once had on the secure
disk image but have long since removed.
I first created an iPhoto library on my secure disk image by holding the option key and invoking iPhoto.
I removed that library awhile ago....
So how do i make iPhoto remove a no longer used iPhoto library?

Disk image password recovery

Hi, I have a slight problem and have locked a disk image with a password and cannot unlock it.
I have checked my keychain and that password does not work. Is there a way to crack or recover the password or do I have to say bye to my precious disk image?
MacBook Pro 15" 2GHz Mac OS X (10.4.7)

Saagar,
You're going to have to say goodbye. Sorry.
Scott

Disk Image Password and File Questions

Hi, I created a sparse disk image to protect some files and included the password in my keychain. Can I reverse this decision? Also, if I delete the files in the sparse disk image, are the files deleted totally from my iMac, or are they just no longer encrypted and password protected? Thanks.

Thanks a lot, now when I open the image a password is requested which I prefer. Still, I've saved my Turbo Tax file in the image, but I'm able to open TT without supplying the password, shouldn't I be prompted for the password since it's in a password protected disk image? Unfortunately TT no longer protects files on a computer, a user is supposed to create an Intuit account to save the tax file password online. What a hassle.

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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Cannot see encrypted disk image in ML

I created an encrypted disk image (password protected folder) through Disk Utility in Snow Leopard. However, now that I have upgraded to Mountain Lion, that folder appears to have vanished or is invisible. All my other file are intact but I just cannot see this encrypted folder anymore.
Anyone else having the same experience or able to offer some pointers?
Thanks,
Peter

There would be no reason for Mountain Lion to hide it. That's not normal behavior. Mountain Lion follows the same rules in this regard that Snow Leopard did. But, you can certainly check to see if it has somehow become accidentally hidden by entering the following command into the Terminal (but don't press return yet):
ls -al
Make sure there's a space at the end, and then drag the folder in which the .dmg file used to reside onto the Terminal window. This will enter the path to that folder in the command. Now switch back to the Terminal and press return. Do you see the .dmg file in the listing? If so, copy and paste the Terminal output into a message here, and I can give you a command that will show that file again.
If it's not there, it must have been accidentally deleted. (Again, not normal behavior, so most likely either it was accidentally deleted by you or someone else who uses that machine or the hard drive is badly corrupt and files are going missing.) Do you have a backup of that file?

Any gotchas for encrypted disk images?

I am about to set up e-bills and e-statements at various banks and credit cards and wanted to check a couple of things before doing something that may end up being bad
The assumption I am going with, is I will create an encrypted disk image to store all the PDF's.
1. Is that the right thing to do? Or is there a better way to keep the data secure?
2. If I do so, what is the backup impact? Can I simply set up a task to copy and paste the entire disk image to my external drive?
3. If I want to open the disk image on another computer, can I? How will it authenticate the user/pass on a different computer?
4. I can backup an encrypted disk image to a FAT-formatted external drive?
5. And finally, I have read disclaimers that if I forget the password the data is lost irretrievably. But also, that the password is stored in keychain. So if the password is stored in keychain, the worst-case scenario can only happen if I forget the master password, right? I don't need to truly remember the password to the disk image necessarily, right?

baltwo wrote:
Your profile info indicates that you're running Tiger. If so, post to those forums. If you're running Leopard, update your profile info. What are you trying to protect and from who? Is your computer secure?
IIRC, encrypted disk image passwords are independent from Keychain Access. So if you forget it, then you're hosed. BTW, that's the major failing with encrypted anything. If you forget the password, you're hosed. If the disk image gets corrupted, it's useless with or without the password. Anything stored in an encrypted disk image needs to be backed up in an unencrypted state and stored in some kind of physical thing like a safe. Methinks your a bit paranoid. Disable auto-login, use high-level passwords (that you remember), don't enable the root user account or activate a master password, and you should be secured enough.
I updated the profile. I am running Leopard. So this is the correct forum.
What am I trying to protect? I thought I put it in the first line - statements from banks and credit cards.
From whom? From unwanted entities who may get access to my computer, in any way.
I didn't get the part about the safe. Can I or can I not back up an encrypted disk image to an external drive "as is"? What about possibly opening it up on another computer? And how about putting it on a FAT-formatted disk? I repeat my original questions, but for a reason - they seem to have not been answered.
I do not have auto-login, and I remember my strong login password. I don't have my root account enabled. Under this scenario you think my data is going to be secure? What about if someone were to get control of my computer? Forgive me on this one, I am a switcher so there is a general paranoia about such things which I would like to clarify before reorganizing my life.

Problems with ecrypted disk image

I'm trying to restore my laptop (Titanium DVI) from an encrypted disk image, and am having no luck. I have my laptop in target disk mode hooked up to a Mac Pro with the backup disk image.
When I use Disk Utility and attempt a restore, it prompts me for the disk image password, and it starts copying (and apparently succeeds in copying some items). But then after only a few seconds, it prompts me for the disk image password again, and I enter it again, and then I get an error 2, no such file or directory and it dies. After this subsequent attempts without rebooting result in error 16, Resource busy. Finder shows no disks mounted, but a ls of /Volumes shows that there are in fact copies mounted there. unmounting them from the command line does not clear the resource busy problem, but rebooting does.
I thought maybe the encryption is confusing things -- support for this seems sketchy. There seems to be no provision with command-line asr to deal with encrypted disk images. Also, hdiutil can do some things, but for instance I can't use convert to read the old disk image and create a new one, because it tries to apply the -stdinpass option to the new image, not the old one. I'd like to try making an unencrypted image to see if that is causing the problem.
edited to add that I'm doing an erase restore.
tom

You choice. Since the immediate problem's was solved, you might want to start a new thread on the diskutil issue in the Unix forum: http://discussions.apple.com/forum.jspa?forumID=735 and start a new one in the Using Mac OS X Tiger forum on any Disk Utility issues.

Trying to create a password protected disk image in 10.8.4

Trying to create a password protected disk image in 10.8.4. I follow steps in Apple:Support but I get an error saying "Resource busy"?

Please read this whole message before doing anything.
This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of the test is to determine whether the problem is caused by third-party software that loads automatically at startup or login, by a peripheral device, or by corruption of certain system caches.
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards. Boot in safe mode and log in to the account with the problem. Note: If FileVault is enabled on some models, or if a firmware password is set, or if the boot volume is a software RAID, you can’t do this. Ask for further instructions.
Safe mode is much slower to boot and run than normal, and some things won’t work at all, including sound output and Wi-Fi on certain iMacs. The next normal boot may also be somewhat slow.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin. Test while in safe mode. Same problem? After testing, reboot as usual (i.e., not in safe mode) and verify that you still have the problem. Post the results of the test.

Encrypted blank disk image, actually encrypted or just password protected ?

I created 200 GB blank disk image on external drive using disk utility with options 128 bit encrytion. I have thought that the data copied to the disk is just password protected not encrypted as such.
I came to conclusion as when you encrypt Mac internal HDD, you can see encryption/decryption progress in Time Machine(system preferences) where as I do not see any encryption/decryption progress for encrypted disk image while copying huge data.
Anyone knows about it ?

As of OS X 10.7.4, Disk Utility had a bug that prevented it from creating an encrypted disk image with a password of more than 10 characters. I haven't checked recently to see whether that bug has been fixed, but from your report it seems not to have been. There is a workaround, but it's complicated.

Version doesn't work on external password protected disk image

Version doesn't work on external password protected disk image.
Any ideas?

Hi
Did you assign the external monitor as a primary display in the graphic properties?
I think you did it due to the fact that the Toshiba boot display appears on the external monitor.
But just moment please. The Tecra M7 was delivered with the Win XP Pro tablet edition and not with Vista.
Did you install it at you own hand?
I presume everything has worked running Win XP
Maybe you should try remove the graphic driver from the Vista system and use one from the 3rd site like www.laptopvideo2go.com

Lost password for encrypted disk image

i created a encrypted disk image to store some personal files and now i can not remember my password and its not in my key chain is there a way to reset the password or at least recover the files.

If you could access the files on an encrypted disk image without knowing the password, there wouldn't be much point in encrypting it.
Do you remember anything at all about the password? Was it a name, or a dictionary word? If so, there might be hope of cracking it before the Earth passes away. You'd need the help of a consultant to do that.

Password Protect folders (non sparse disk image)

So there are a collection of files I have protected on my computer using the disk utility method that everyone asking this question uses. I am curious to know if there is any other way of doing it. I want to password protect a folder within this protected disk image just becuase i feel like being extra sneaky and careful at the moment. I mean I could just use another sparse disk image inside the original and use two different passwords but I'm trying to be creative and that could get confusing. Does anyone know of a way to password protect a folder or file without using the disk utility method in Lion? Even if it requires third party stuff

nails:
From your earlier posts I gather that you would like to have a high level of security for your data. If an encrypted folder does not do the job for you, you may want to consider FileVault. However, if you use FileVault there are to very important measures you must take: 1) You must remember your password. If you lose or forget your password you will lose aceess to your data permanently. There is no way around it. 2) You must leave adequate space to be able to disable FileVault, should you every need to do so. The encrypted sparseimage requires almost double the size of the image to be able to be expanded.
Here are a few articles that might be of interest to you:
A Word about FileVault
About Encrypted Disk Images
How to create a password-protected (encrypted) disk image
Please do post back with further questions or comments.
Happy Holidays.
cornelius

Encrypted disk image no longer demands password

Some time ago I created an encrypted disk image for storing sensitive data. It has been working fine for months, everytime I clicked on it it demanded that I enter the password before it mounted. But suddenly yesterday it stopped demanding he password and would just mount upon clicking. Tried restart, no change. Tried repairing the disk permisssions, no change. In the meantime, I have created a new encrypted disk, moved all the info to that, and secure-trashed the old one. But this gives me pause for thought. Not terribly secure! Anybody know what might have happened? How can an encrypted disk suddenly become unencrypted?

No, there's no other explanation, unless someone tampered with your account. Launch the Keychain Access application and look for a password item in your login keychain with the name of the image file.

Disk Image Password

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