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Using Encrypted DMGs In Mac OS X
Mar 11, 2025
How to use Encrypted DMGs to keep files secure. Article: http://www.cultofmac.com/127028/format-a-flash-drive-to-work-with-os-x-and-windows-video-how-to/
View Video Transcript
0:09
hey everyone today I'm sure how you can
0:11
keep your files safe by using encrypted
0:14
disk images in Mac OS 10 line now you
0:16
might be saying that there's an easier
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way to do this and that is with file
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evolve and while filevault is built
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right into OS 10 and it's easy way to
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encrypt your files it's not ideal if you
0:27
only want to keep a few items safe and
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locked away so that's what i'll be
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showing you how to do in this video so
0:35
you're going to need disk utility for
0:36
this and the easiest way to go define
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that is to open up a new Finder window
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go to your hard drive and from there the
0:43
Applications folder and then utilities
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and utilities you should find disk
0:48
utility and you can open that up now in
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disk utility it's fairly simple all you
0:52
have to do is select new image and here
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I can select a title for the image so
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let's say I want to call this image
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image now this is the title of the image
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that you're going to see when the file
1:04
is on a desktop and under name this is
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the name of the disk image actually has
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when you see a mounted in finder so I'll
1:13
call this one a disk so you can see the
1:14
difference between over later and then
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from here I can choose the size of the
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disk image and there's a whole bunch of
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different sizes or I can choose custom
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and then here I can choose sectors
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kilobytes megabytes gigabytes or
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terabytes and of course if your drive
1:28
isn't several terabytes in size you're
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not going to want to choose several
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terabytes because it's not going to work
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much for this demo I'm just going to
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choose the default 100 megabytes the
1:39
important word of note is that once you
1:40
choose the size of the disk image you
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cannot switch it back after you've
1:44
created it and you cannot put any files
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in this image that exceed 100 megabytes
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and once you've filled it up that's it
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you can't keep adding more files unless
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you delete some let me move to be format
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section now there's a lot of different
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formats here and any of the mac OS
2:00
formats will not work on a Windows
2:02
computer if you choose to use the image
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on more than one computer well if you
2:07
want to know more about formats you can
2:09
check out another video I didn't call
2:10
the mac and of course i'll have a link
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to that post below the video of c
2:13
you can watch that as well and then
2:16
here's where I can select encryption now
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there's two different types of
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encryption and the best one to choose is
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128-bit aes encryption that is
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recommended if you choose something like
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256-bit it's incredibly secure but it's
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much slower and really anything over 128
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is that really necessary and then under
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partitions the thing that I always
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choose and the best thing in here is
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single partition and that is the Master
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Boot Record partition map so this is
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what's standard and unless you want to
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use your disk image for other purposes
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this is what you want to choose and then
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from here you can choose an image format
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now the default is read and write this
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image and that's what we're going to use
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for this but if you choose something
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like a sparse image that will actually
3:00
grow over time as you put files in it
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which is nice because then you don't
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have to worry about to be in this case
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100 megabytes size limit but for now
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we'll just leave it like it is and then
3:10
term here I can select create and it's
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going to ask me for my password for this
3:15
demo I'm just going to use password as
3:16
the password which is not secure at all
3:19
but it's just the demo and you can see
3:21
the password train is very weak now I'm
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going to uncheck remember password on my
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keychain because if you leave this
3:27
checked anytime somebody on your
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computer tries to open this kimmage
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it'll let them right in because the
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passwords in your keychain so I'm going
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to uncheck that and select ok and it's
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going to create the image rather fast in
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this case because it's only a hundred
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megabytes and I'm here on the desktop
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you can see image that dmg and this is
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your disk image so if I open up a new
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Finder window you can see that it's
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mounted right here and it's just called
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disk and now I can drag whatever files I
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would want to into it ml copyright it in
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and then I can eject the disk and now
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once the disc is injected if I try to
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open it up right here you can see it's
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going to tell me to enter the password
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before the image so I'll just enter
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password and now if I open up a new
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Finder window it'll let me write in and
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there I can see all my encrypted files
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so there you go there's how to use
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encrypted disk images in Mac OS 10 this
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is a great way to keep some of your more
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sensitive files safe if you have any how
4:25
to is that you'd like to see me do make
4:26
sure
4:27
send me an email I hope you found this
4:28
video useful thank you for watching
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