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How to create a password-protected (encrypted) disk image in Mac OS X 10.3 or later

You can move files to or from an encrypted disk image as easily as you can from a non-encrypted disk image. Follow these steps to create an encrypted disk image:

  1. Open Disk Utility (/Applications/Utilities/).
  2. Mac OS X 10.4, 10.5 or later: Click the New Image button, or choose New > Blank Disk Image from the Disk Utility File menu.
    Mac OS X 10.3 through 10.3.9: Choose New from the Disk Utility Image menu.
  3. Enter a name in the Save As field. This name is used for the disk image (.dmg) file.
  4. Change the save destination if you wish to.
  5. Select a size for the image file from the Volume Size pop-up menu (Size in Mac OS X 10.3) .
  6. Choose a volume format if you don’t want to use the default Mac OS X Extended (Journaled).
  7. Choose an image format. You can use “sparse disk image” for a disk image that only uses as much space as it needs, rather than a set amount of space. If you’re not sure, use “read/write disk image” choice.
  8. Choose 128-bit AES (and/or 256-bit AES in Mac OS X 10.5 or later) from the Encryption pop-up menu to encrypt the image’s contents with a password. If you don’t choose an encryption, your new image won’t be encrypted.
  9. Click the Create button.
  10. Enter and verify a good password in the dialog window that appears. This password will be saved in your keychain by default, or you can deselect “Remember password (add to keychain)” if you don’t want that. You can store the password in the keychain both for convenience and for reducing risk of password loss.
  11. Click OK.

Important: If you forget the password, data stored in the encrypted disk image cannot be retrieved. If you have saved the password in the keychain file, the password will be available to you there.

 

!! Cheers !!

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About Muzammil

Over the past 6 years, I have designed, developed and managed over 150 iPhone/iPad applications for many large-scale clients, some include Rolex, Ford, Makemark LLC, Source Digital Production, IT City (Kingdom of Saudi Arabia), R.Ø.S.A. Creation etc. These applications ranged from simple navigation bar application to high end user interface design for image processing, simple games with Core Graphics and OpenGL. Before started Triffort Technologies i was working in Ampere Software Pvt Ltd as a senior iOS Developer. I was the first employe of Ampere who started iPhone/iPad development in the company. In ampere i worked on some complex apps like Boxboss, Austin Post, User Tracking etc. Throughout my career, I have used Core Graphics, OpenGL, SQLite, Core Data, JSON, XML etc. I am very proficient in many design programs including Photoshop, Illustrator, Flash, iMove. Although I am very knowledgeable in all Adobe Products. Most the time i am designing my apps without taking help from any graphics designer. I love to make app from my designs. It feels great when you are creating app from scratch and no body else is involve in your ideas. You are free to do anything. As the Senior Developer and Team lead at Triffort Technologies, I managed a team of Technical Interactive Developers and Designers. As their manager I am responsible for scheduling, resource management, task reviews, process development and enhancements, employee reviews and new employee hiring. I believe good employee morale and communication are key factors to successful, creative work, therefore, positive feedback was part of my daily routine. But most of the time you can find me on my desk writing codes for some app. I love programming. This is my passion. I’m a team player. I am a motivated individual who enjoys taking on new challenges and learning new technologies. I am well organized and a proficient multi-tasker. I have strong problem solving skills such as the ability to use technology in creative ways to meet unique project requirements. I love to be challenged and I always have a positive outlook no matter how tight the deadline is. If you would like to contact me or find out more about my experience, please contact me at muzammil@triffort.com or you can Skype me at muz.iphonedev.

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