1. Mac Dmg Decrypter
2. Decrypt Dmg File Linux
3. Decrypt Dmg File Without Key

A dmg file is a compressed file structure, capable of containing folders, files, etc. Dmg files can be used for a variety of purposes, from encrypting a home directory (ie – FileVault) to encrypting a file structure manually. A dmg file can be encrypted fairly simply. From Disk Utility, create a dmg file by clicking on the File menu and selecting New and then Blank Disk Image. This will bring up a screen where you can provide a name for your home folder and a size, then select either AES 128 or AES 256, which is a bit slower.Go ahead and click on Create and then at the resultant password screen go ahead and provide a password to be used. And let’s just go ahead and uncheck the option to create an entry in Keychain for the password.If you would rather do so from the command line I covered how to do so in a previous post.Now let’s download Spartan, a tool built by Ryan Kubasiak. Now download a dictionary file. I just used one of these (and for expedience sake I paired down the contents to only have about 100 possible passwords, one of which was mine). Now go ahead and open Spartan, clicking on Go! at the splash screen.At the Choose a File screen, browse to and then select your password file, clicking Choose once you have done so. At the next Choose a File screen browse to and then select your dmg file which you would like to crack the password for. The password file will then be read into RAM and the password cracking will commence.According to the length of your password this could take a long, long time, but when it’s done you will have your password, assuming it was in the dictionary of passwords you used. Dictionary files can be downloaded from a variety of sources, some collections taking up gigabytes upon gigabytes of space and covering every possible keyboard combination. Therefore, the longer the password that you use and the more complex the password is, the longer it will take to break the encryption.“So, would your holiness care to change her password?” – The Plague

This is basically a GUI wrap over of VFdecrypt. With this application you will be able to decrypt the root DMG of the firmware ipsw of your choice. Everything is very simple and does what it says. The application is easy to use because of the drag and drop feature.

Original source: https://github.com/0xced/iOS-Artwork-Extractor/wiki/Extracting-more-artwork

You can extract even more artwork if you decrypt and mount an iOS firmware (.ipsw file).

Requirements

1. Python 3.2 (required by ipsw_decrypt.py)
2. VFDecrypt (required by ipsw_decrypt.py)
   Make sure to install the vfdecrypt binary somewhere in your PATH or use the -d option of the the ipsw_decrypt.py script.

VFDecrypt Usage:

How to decrypt and mount an iOS firmware

1. Download an iPhone or iPad firmware that matches your simulator version and make sure that there is a VFDecrypt Key by checking the corresponding Build column. For beta versions, check the VFDecrypt Keys page instead.

Mac Dmg Decrypter

System Firmware Image ipsw

Version	Build	Codename	Baseband	Release Date	IPSW Download URL	SHA1 Hash	File Size
9.0	13A343	Monarch	1.00.05	16 Sep 2015	iPhone8,2_9.0_13A343_Restore.ipsw	62c84322d95913ddcee8337c0998988c6acd330e	2,369,374,167
9.0.1	13A405	Monarch	1.00.05	24 Sep 2015	iPhone8,2_9.0.1_13A405_Restore.ipsw	c13f78d5967632732841fcae9840bfd37d09b5af	2,368,629,853
9.0.2	13A452	Monarch	1.02.00	30 Sep 2015	iPhone8,2_9.0.2_13A452_Restore.ipsw	46b922b4755fcb66e9f33dd491002e120b88908a	2,369,099,889
9.1	13B143	Boulder	1.14.00	21 Oct 2015	iPhone8,2_9.1_13B143_Restore.ipsw	634807da8e723d688419b56f14b0913aee317760	2,383,904,492
9.2	13C75	Castlerock	1.23.00	8 Dec 2015	iPhone8,2_9.2_13C75_Restore.ipsw	f89ea6f273dde92167c408decdb5db3daa756a19	2,382,945,535

Backup Firmware Image

1. Start iTunes on your computer, and then connect your iPhone to your computer using its sync cable.
2. Click the button for your device near the upper-right corner of the iTunes screen, and then click the 'Summary' tab if it isn't already selected.
3. Select 'This Computer' in the Backups section, and then click 'Back Up Now.' ITunes backs up your entire iPhone, including iOS, to the hard drive.
4. Confirm that the backup was successful by selecting 'Preferences' from the main iTunes menu, clicking the 'Devices' tab, and then making sure that the time and date next to your iPhone's entry correspond to when you finished the backup.
5. Disconnect your iPhone from your computer.

Decrypting with ipsw_decrypt.py

1. Run the ipsw_decrypt.py script on the firmware you downloaded or backed up.

   The output should look like this:

2. Go into the iPhone 4, 5.1 (9B176) folder or whatever folder was created depending on the firmware you chose.

3. Open the biggest file ending with .decrypted.dmg in order to mount the disk image. In this example: 038-1768-165.decrypted.dmg

4. Run iOS Artwork Extractor. If the mounted iOS firmware version matches your simulator version, then you will discover much more artwork.

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   Non-Macintosh systems may access DMG files and extract or convert them to ISO image files for burning. Several applications are designed to offer this solution for Windows systems. 7-Zip and DMG Extractor are the best options to open DMG file on Windows because they are compatible with the most DMG variations. For Linux a built-in 'cdrecord. Whether you are an avid Mac programmer using a Windows PC, or you just found a DMG file on your Windows machine, it can be useful to know what it is and how to open it. Luckily it’s easy to open on Windows if you know how. Open DMG File. The usage of the DMG file extension is in the context of a mountable disk image file which is generated by the Mac OS X Operating System platform. Once the file is opened, the system will mount it in a virtual disk located on the user's desktop. How to open .dmg file. In order to open your DMG file navigate to it using 7-Zip file navigation interface and click on the file name. You can also type a path to your file using an address bar at the top or select File-Open to open a file at specific location. This will open DMG file contents and you will be able to see what is inside it. 7-Zip will show file sizes. A file with the DMG file extension is an Apple Disk Image file, or sometimes called a Mac OS X Disk Image file, which is basically a digital reconstruction of a physical disc. For this reason, a DMG is often the file format used to store compressed software installers instead of having to use a physical disc.

Decrypt Dmg File Linux

iOS 8 firmware

Decrypt Dmg File Without Key

VFDecrypt Keys are not widely available for iOS 8. You will have to use vfdecrypt directly on the unzipped iPhone 4S ipsw with the key provided by @iH8sn0w:

@Jato_BZ which keys? Or just rootfs like the 4S one? 5059b2da95c93f754ce4a701cf6564877dfee899ad884d78f3403dcec7bbd6fe6d3079a8