The reason it’s so slow is because your AES256-encrypted DMG uses 250,000 rounds of PBKDF2-HMAC-SHA-1 to generate the encryption key. The ludicrous round count makes it extremely computationally expensive, slowing down the HMAC-SHA1 process by a factor of 250,000. Send the original encrypted file to the designated recovery agent, namely the file encryption software provider. Use the agent's recovery certificate and private key to decrypt the file. Wait the decrypted file back to you, using any file transfer method that is desired. Steps to recover files with Bitwar Data Recovery Step 1.

Summary:

Generally, files were encrypted by virus attack will cause the file path or drive inaccessible. Then how to decrypt a file when key, password or certificate? Today in this article we will guide you to perform encrypt file recovery to get back the original files before decryption om Windows 7/8/10.

EFS encrypts tool on Windows 7/8/10

Normally if we would like to keep secrets on the privacy files, most of the users will consider EFS encrypt tool. EFS is short for Encrypting File System, a Microsoft Windows encrypt tool that provides filesystem-level encryption, the technology enables files to be transparently encrypted to protect confidential data with physical access to the computer.
However, EFS will need a file encryption key, we called FEK to access the files. Generally, it allows the user to export the pfx certificate and you'd better save carefully to the safe path to make sure the files can be accessed.

How to decrypt a file after lost EFS certificate?

Method 1. Know first how the virus kidnaps the files
Make copies of the files or folders >> Encrypt the copies >> Delete Original files or folders
By knowing how the ransomware works, we can then try primarily to use Bitwar Data Recovery software, which is a free trial data recovery software has powerful functions that allow users to recover original files or folders which deleted by virus or Trojan.

Method 2. Clear encryption attribute

1. Open Windows Explorer
2. Right-click the encrypted file or folder, and then click Properties.
3. On the General tab, click Advanced.
4. Clear the Encrypt contents to secure data checkbox.

Method 3. Ask the recovery agent for help

1. Make a copy of the file in case of loss or damage.

2. Send the original encrypted file to the designated recovery agent, namely the file encryption software provider.

3. Use the agent's recovery certificate and private key to decrypt the file.

4. Wait the decrypted file back to you, using any file transfer method that is desired.

Steps to recover files with Bitwar Data Recovery
Step 1. Download and then Install Bitwar Data Recovery to the partition or external drive that has no encrypt files.

Step 2. Launch the software and then select the partition or device you have the files being encrypted.

Step 3. Run Scan to search original files and you can even double click the files to preview the files, hit Recover after selected target files or folders.

Tips: Please DO NOT save the files back to the partition or device where has encrypted files.

A safer way to keep the certificate

1. Once exported the certificate, send this certificate to someone you can trust.
2. Ask him/her to send back the certificate to you to decrypt files.

Conclusion:

Follow up the tutorial and you may have no trouble on how to decrypt a file easily and quickly without certificate, key or password again. However, please aware that if the files were encrypted by a third-party tool, it won't work for you to decrypt that file.

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Decrypt Any File

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:

Decrypt Dmg File Without Keys

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.

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

Decrypt Text Message Without Key

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.

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:

Decrypt Efs File Without Certificate

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