Jeremiah Grossman is widely considered to be one of the world's most talented ethical hackers, but even his ninja-like prowess wasn't enough to recover a forgotten password used to encrypt sensitive work documents contained on his MacBook Pro.

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After fiddling with a freely available password cracking program, the CTO of Whitehat Security soon realized that its plodding speed—about one password guess per second—meant it would likely take him decades of tries before he arrived at the right one. That's when he called in the big guns, namely Solar Designer and other principals behind the free John the Ripper (JtR) password cracker as well as Jeremi Gosney, a password security expert at Stricture Consulting Group. (Ars has chronicled Gosney's cracking prowess in articles here and here.)

'Collectively, these guys are amongst the world's foremost experts in password cracking,' Grossman wrote in a blog post describing the odyssey unlocking the crucial files. 'If they can't help, no one can. No joking around, they immediately dove right in.'

Sep 10, 2018 Auto-Tune Pro Antares 9.1 64-bit (VST, AU and AAX) Mac OSx 10.11, 10.12, 10.13, 10.14 Instructions: Attached Direct Download Link (535MB). If I must hand over my admin password, the person now on the desktop should still have a difficult time learning these disk images exist and a password is required to open them. As they begin to snoop around, image the drive, run forensics, etc., they should feel they have the keys to the kingdom. Dec 16, 2009 #2 No. Disk Utility warns you when making encrypted disk images that the data on them cannot be recovered if the password is lost. Because.that is kind of the point of an encrypted disk image. No password = data is not readable.

Security concerns—not to mention the enormous size of the DMG encrypted disk images—prevented him from sending the files directly to his rescuers. So he availed himself of a feature in JtR called dmg2john, which separates the encryption contained in a DMG from the data it's protecting. That allows the cracking program to target the password protecting the file without exposing the underlying data.

But even then, there was a problem. Grossman's AES256-encrypted DMG used a staggering 250,000 rounds of PBKDF2-HMAC-SHA-1, an algorithm designed to run extremely slowly to make the job of password cracking harder. Gosney's Xeon X7350 could crack a single round of HMAC-SHA1 at a rate of about 9.3 million hashes per second. By forcing Gosney to repeat the process 250,000 times, his system was reduced to just 37 or so hashes per second. Even using all four processors of his machine, he could bump up the performance to only about 104 hashes per second. (JtR doesn't support graphics cards when cracking Apple's latest DMG formats.)

Apr 20, 2018 If you don’t see the password hint show up, you should check if you set to show the password hints in the Login Options. To ensure that a password hint shows up in case you forget the password, simply navigate to System Preferences Users & Groups Login Options, then you log in and choose the box saying “show password hints”.

Grossman continued:

Once understanding this, Jeremi begins asking for more information about what the extra six or so characters in my password might have been. [Were] they all upper and lower case characters? What about digits? Any special characters? Which characters were most likely used, or not used? Ever bit of intel helped a lot. El capitan 10.11.0 download dmg safe size. We managed to whittle down an in initial 41106759720 possible password combinations to 22472. This meant the total amount of time required to crack the DMG was reduced to 3.5 minutes on his rig.

Subsequently, Jeremi sent me what had to be one the most relieving and frightening emails I’ve ever received in my life. Relieving because I recognized the password immediately upon sight. I knew it was right, but my anxiety level remained at 10 until typing it in and seeing it work. I hadn’t touched my precious data in weeks! It was a tender moment, but also frightening because, well, no security professional is ever comfortable seeing such a prized password emailed to them from someone else. When/if that happens, it typically means you are hacked and another pain awaits.

Interestingly, in living out this nightmare, I learned A LOT I didn’t know about password cracking, storage, and complexity. I’ve come to appreciate why password storage is ever so much more important than password complexity. If you don’t know how your password is stored, then all you really can depend upon is complexity. This might be common knowledge to password and crypto pros, but for the average InfoSec or Web Security expert, I highly doubt it.

Grossman's predicament, and the techniques used to resolve it, underscore the never-ending battle between password security and the latest cracking strategies. For much more about the techniques used to create and defeat strong passwords, see the Ars feature 'Why passwords have never been weaker—and crackers have never been stronger.'

DMG files can be loaded directly on an Apple Mac, but they are not so good on Windows computers. Free program to convert dmg to iso. If you want to install a Mac operating system on a virtual machine on a Windows computer, then DMG is not acceptable. The DMG file is Apple Disk Image file commonly created and used by the MacOS X platform for applications distribution.

An upgradation to the latest version is suggested by the owners of the OS to enable an addition of the latest features unique to this release. Hence, modifications tothe existent OS resulted in the birth of version 10.7.5. 10.7 lion download dmg windows 7. Apple Mac OSX Lion 10.7.5 Direct DMG TorrentThe version 10.7.5 is here and it is the latest in its domain.

How can I run a dictionary attack against a password-protected disk image file on OS X?

I created the disk image, but have forgotten the password. I'm pretty certain that the password I used would be short and not terribly fancy, so it should succumb to a brute-force attack pretty quickly, if I knew how to run one against it.

posted by alms to Computers & Internet (16 answers total) 1 user marked this as a favorite

you can open disk images with passwords using AppleScript. It won't be terribly quick, but it'll do the job.
posted by bonaldi at 3:04 PM on September 24, 2006

bonaldi, thanks for the pointer. That's very helpful.
The related question is whether there is an optimal way to generate passwords to throw at it. The 26 letters plus 10 digits gives almost three trillion passwords even at just 8 characters.
posted by alms at 3:24 PM on September 24, 2006

It depends on how well you can roughly guess what you made the password. If you only ever use english words, for instance, you can narrow it right down. There are english dictionaries out there you can patch in.
posted by bonaldi at 3:34 PM on September 24, 2006

Bonaldi, are you sure it is possible to open disk images with passwords using AppleScript? I've looked around trying to find out how to do that, and the only scripts I've found just invoke hdiutil, which as far as I ca

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