Take the 2-minute tour ×
Ask Different is a question and answer site for power users of Apple hardware and software. It's 100% free, no registration required.

I'm in trouble right now.

I used Disk Utility to create a sparse image and I cannot remember the password, when I created the file I didn't select to remember in keychain.

Now, I try to enter the possible value but it doesn't work. Is there any recommend way to crack the password or give some hint or some app that might be worked on this stuff.

I really need to use the data in that file.

share|improve this question

5 Answers 5

Nope, with the strong encryption that Apple uses, if you lose the password, you are out of luck.

share|improve this answer
    
But try to guess wil not harmful to my file, right? –  user40436 Jan 26 '13 at 14:36
    
Right, You can guess as much as you want and the file will be fine. –  Mark Jan 26 '13 at 14:40

It depends on the quality of your password, the quality of your dictionary, your time and cpu power ... https://www.georgestarcher.com/?p=228 or Spartan google helps.

share|improve this answer
    
Hi, i cannot open crowbarDMG-v1.0.dmg, it said that "The following disk cannot be opened" and the reason is not recognized. Any suggestion?? –  user40436 Jan 26 '13 at 15:38
    
It opened ok for me, maybe you got a corrupted download? The file size I got (for the .dmg) is 1,753,195 bytes, and its md5 hash is 49e1a8dc0b74d04eb06db26ade25bc26. –  Gordon Davisson Jan 26 '13 at 17:33

"Encryption: DriveSavers engineers have been trained and certified by leading encryption vendors, such as GuardianEdge, Utimaco Safeguard, PGP and PointSec, to safely recover file-level and disk-level encrypted data" http://www.drivesavers.com/recovery-services/encryption/

share|improve this answer
1  
From the same web site: "The encryption username, password and/or key must be provided to DriveSavers if this method is chosen". Doesn't look like they are able to crack passwords themselves. –  patrix Jan 26 '13 at 20:40

CrowBar is somewhat out-of-date.

Probably the most comprehensive and up-to-date free password-recovery package is JohnTheRipper. Among many other formats, it can test .dmg's as well.

Note that JtR does not "break" the encryption, it just automates and speeds the process of trying thousands (or millions, or trillions) of dictionary-based and random passwords in hopes of eventually hitting the correct one that decrypts your data.

JohnTheRipper is a command-line tool and requires one to be pretty well-versed in standard shell syntax, etc.

If you don't want to compile JtR yourself, there are also free unofficial pre-compiled Mac OS X binaries available.

The latest "jumbo" and "magnum" community-contributed versions can handle .dmg files, sparse-images through OS X 10.7. If you dig around in the recent patches you can even find code to handle OS X 10.8 passwords.

share|improve this answer

I found this in my own search.. hope it helps. http://crucialsecurityblog.harris.com/2011/03/30/4/

"Crack and Image a FileVault Sparsebundle"

share|improve this answer

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.