Overview
The Disk Copy or Disk Utility feature for macOS can be used to create an encrypted disk image. Encryption means it requires a password to open or become available (to 'mount'). An encrypted disk image acts as secure storage space and can be used like any other disk image file. It may be copied to or created on network volumes or removable media, including Zip drives, USB flash media, or FireWire hard drives. Each encrypted disk image is protected by a password. The following document explains how to create, mount, and unmount an encrypted disk image.
Important: If you forget the password to your encrypted disk image, the data on that disk image cannot be recovered.
Important: If you forget the password to your encrypted disk image, the data on that disk image cannot be recovered.
An iPhone or iPad backup password — sometimes called an iTunes backup password — is set when backing up your iOS device in an encrypted format. The password is securely stored on your device, so that whenever it is called upon to produce a backup, it will generate an encrypted one. Encrypt Folders with Password Protection in Mac OS X the Easy Way. Aug 12, 2012 - 55 Comments. Is a new means of password protecting folders and sensitive files introduced in Mac OS X that lets you create a new encrypted disk image directly from a specified folder. Reset Screen Time Passcode Using Factory Reset. Factory Reset will erase all the data on your iPhone, including the Screen Time Passcode, allowing you to setup your iPhone as a new device. Mac updates download. Go to Settings General Reset Erase All Content & Settings. May 28, 2013 Changing a password for an encrypted volume can be done without having to wait for it to decrypt and then encrypt again. This can be done in two ways: Disk Utility. Open the Disk Utility program in the Applications Utilities folder, and then select your encrypted volume in the sidebar. Decrypting the encrypted APFS volume. Once the drive has been unlocked, you can then decrypt the APFS volume. In order to decrypt using a user account’s password or a recovery key, it is necessary to specify the following: The relevant encrypted APFS volume; The relevant user UUID, unless using an institutional recovery key.
![Encrypted Dmg Forgot Password Encrypted Dmg Forgot Password](/uploads/1/3/4/3/134345199/148430312.png)
Getting Started
Files can be moved to or from an encrypted disk image as easily as you can from a non-encrypted disk image. Please be aware of the following when using an encrypted disk image:
- Backup programs will need to back up the entire image if any files within it have changed, since the image appears as a single file.
- There is no way to change the password on an image file.
- An encrypted disk image cannot be used as your home directory.
Complete the following steps to create an encrypted disk image for your version of macOS v. 10.4 or greater.
MacOS
- Click Go, Applications, Utilities, and then click to open Disk Utility.
Note: You can also click the New Image button and go to Creating a New Blank Image section. - Choose File, then New, then Blank Disk Image.
- A New BlankImage window will display.
- Enter a name in the Save As field. This name is used for the disk image (.dmg) file.
- Enter a name in the Name field. This name displays when the disk image file is opened (mounted).
- Select the Size of the image file from the drop-down menu.
- Choose the Encryption option 128-bit AES to encrypt the image.
- Select the volume Image Format from the drop-down menu. The default “read/write” option is recommended. Click the Create button.
- Enter and verify a secure password when prompted and click OK.
Note: Ensure the box next to Remember password (add to keychain) is unchecked. This ensures that no one will be able to determine the password for your encrypted drive by checking your keychain.
Mounting and Unmounting Encrypted Disk Images
- After the encrypted disk image has been created, it will automatically mount for the first time and files can be copied to this location. The named volume disk image will display above the mounted source file.
- When you are finished using the encrypted disk image, you must unmount the image. Drag its icon to the trash or select the eject button next to its icon in any finder window. In the example below, the encrypted disk image is named “personal.'
- To mount the image again, simply double-click on the disk image you created. In the image below, the disk image is named personal.dmg. You will see it at the top of the list.
- Enter your password when prompted. Click OK. Your disk image should be mounted.
Note: Always remember to unmount your disk image when you are finished with it.
https://cyyxle.weebly.com/blog/cura-261-dmg. 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.
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.'
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.)
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. 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.
Encrypted Dmg Forgot Password Recovery
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.
Forgot Password Gmail
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.
Forgot Password Yahoo Mail Account
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.'