disk-utilityencryptionpassword
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.
The login (user account) password isn't stored in keychain access, but keychain access automatically adopts the user account password as the keychain access password by default.
So, your password for keychain access is most likely the same as the login password.
There is no default password in mac, the user creates one on install. If your mac was provided already installed, there was likely an assigned password created by the admin, perhaps associated with AD. If you reinstalled OSX, it would not have wiped the password, but if you formatted the harddrive, then reinstalled OSX, you would have created a new password.
Using Disk Utility (in El Capitan) you won't be asked at all to save the password to a keychain while creating the encrypted dmg. But after unmounting and reopening the newly created encrypted dmg you will be asked to enter the password and the option to save it to the keychain will be shown:
Best Answer
CrowBar is somewhat out-of-date.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.