Dmg Extractor The Specified File Could Not Be Decrypted

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

Python 3.2 (required by ipsw_decrypt.py)
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.

Not Specified

Open DMG Files with DMG Extractor. DMG extractor provides another choice for extracting DMG files. The free version works well, but it does have some limitations: You cannot extract files bigger than 4 GB; You cannot extract encrypted files; You can only extract 5 files at a time, which can be a pain if you need to extract an entire DMG file. How to extract files from password protected archives To extract a password protected archive open it with PeaZip (double click if it is a supported file extension) to read and navigate / search its content, then use Extract button in application's toolbar.

VFDecrypt Usage:

How to decrypt and mount an iOS firmware

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.

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

Start iTunes on your computer, and then connect your iPhone to your computer using its sync cable.
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.
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.
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.
Disconnect your iPhone from your computer.

Decrypting with `ipsw_decrypt.py`

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

The output should look like this:
Go into the iPhone 4, 5.1 (9B176) folder or whatever folder was created depending on the firmware you chose.
Open the biggest file ending with .decrypted.dmg in order to mount the disk image. In this example: 038-1768-165.decrypted.dmg
Run iOS Artwork Extractor. If the mounted iOS firmware version matches your simulator version, then you will discover much more artwork.

iOS 8 firmware

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

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DMG is a disk image format used on Mac OS X and it is difficult to open on Windows computer. So, the guide below will let you people give a way to open DMG files on Windows through a free utility name HFSExplorer. Continue reading after the break to read the complete process to do that.

How to Extract DMG File Data on Windows

Step-1

Download and install HFSExplorer on your PC

Step-2

Just follow the installation wizard of HFSExplorer and check mark the box followed by “Register .dmg file association” while you reach on this screen

Step-3

On completion of HFSExplorer install process, you will observe that all DMG files on your computer will get associated to HFSExplorer software.

Step-4

Now, double click on your DMG file to whom you want to open

Step-5

In an explorer window all of the contents of your DMG file will display, so select the file of your choice and click on “Extract” button

Step-6

Just choose the destination folder on your computer and click on “Extract here” button

Step-7

Click on “Yes” button while it asks for “Do you want to follow symbolic links while extracting”