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The Definitive Source for Everything CAC

  Common Access Card) help for your

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utilizing an Intel chip.  If you have the new M1 chip, please look here for support



Big Sur [11.x]

Released on 12 November 2020



I have Mac OS Big Sur on an Intel based Mac, and am able to access CAC enabled websites using the native smart card, and adding the DoD certificates from step 5 on 


 Mac OS 11.xx.x would not read the "G+D FIPS 201 SCE 7.0" CAC with the SCR-3310 v2.0 reader with firmware Version below 6.02.  So, if your reader is below 6.02, you may need to purchase a new reader.

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If you are having problems unlocking your settings in System Preferences due to it not accepting your administrator password or your CAC seemed to have stopped working after upgrading to Big Sur, please verify if your Mac has a T2 Security Chip.  If your computer does, then reset your SMC (System Management Control) by powering down your computer, then holding the power button for 10 seconds.  Then turn your computer on, you've just reset your SMC.  This information was found at:


I ordered a new Mac on 12 November 2020 with the non Intel chip (M1) my findings from this computer can be seen on this page.  My only "fear" with the new chip is compatibility with Virtual Machines (running Windows for certain DoD websites)


Mac users who upgraded to Mac OS Big Sur (11.xx) need to uninstall all 3rd Party CAC enablers per
If you purchased your Mac with Big Sur (Intel chip), you can skip the Macuninstall page, and go directly to the MacNotes page



 How to sign a PDF using Adobe

Please verify these settings on your Mac:
Open an Adobe PDF file,
Select the words Adobe Reader [or Acrobat Reader] (at the top of the screen)
Click Preferences
Under Categories, scroll down to Signatures
In the Creation and Appearance section, click More
Make sure Enable CryptoTokenKit framework support is checked.
You also need to change the Default Signing Format from PKCS#7-Detached to CAdES-Equivalent
Close Adobe Reader
Double click an Adobe PDF file you need to sign


Problems accessing DTS?


You have to use the Safari web browser (Chrome has not worked for anyone)
Select the Show Details (button)
Click the link titled:  visit this website
Click the button that shows:  Visit Website
Enter your computer password, [you are manually adding the web address to your keychain access]. 
Click Update Settings (button)
DTS should now open for you.
I have added some sites I know are having this issue here.  You can download the certificates you need.  Then will only need to double click it and do a manual trust on them. 
Here's How to manually trust the certificate(s): Double click the certificate, select the triangle next to Trust, in the When using this certificate: select Always Trust.



Air Force and Coast Guard users who utilize VMware Horizon need to update their client
Here is the link:



Look here for installation steps
You will see in Table 1 that no CAC enablers are compatible with Mac OS Big Sur. 



Discounted prices on the programs mentioned below can be viewed here

Virtual Machine information

  If your CAC reader is not being recognized by your virtual Windows, follow this guidance: 
VMware Fusion From the menu bar, select Virtual Machine, then USB.  Find your CAC reader and select it.

Parallels Desktop - (In Coherent mode):  Click the red parallel lines in the menu bar, Select Devices,
USB, find your CAC reader and select it.

Parallels Desktop - (Not in Coherent mode):  Simply plug your reader into the computer and select whether you want to use it in Mac or Windows.  You may also need to click the word Devices in the top row, USB, then your CAC reader.

VirtualBox:  Click the word Devices (at the top of the screen), then USB Devices, and select your CAC reader. When you want to use it on your Mac, go to the same location and remove the checkmark.  If you receive an error message when trying to select the reader here follow these instructions:

* In the VirtualBox Graphical User Interface (GUI), click on USB (small icon in the list of devices).
* Then check "Enable USB Controller" and "Enable USB EHCI controlling."
* Lowest on the beach, you'll see a list of icons to your right. Check first. A box appears "a new filter". Check it.
* By clicking on the icon below, representative of a USB plug with a +, you'll see a list of drivers.
* Select the one that corresponds to your USB drive. Check it added in the filter window.
CAC Readers:  With a variety of CAC readers available today there are also a variety of issues.  The SCR series of CAC readers work very well.  The SCR-331 reader may need a Firmware Update.  See several different models of  USB CAC readers here.  You will see a small note on some of the readers to show you how to make them compatible with your Mac.


Air Force users look here for some helpful information


Navy users look here for some specific information



Other versions of Mac OS supported in this website:




Ventura  (13.x) users, utilize the Ventura support page

Big Sur (11.x) users with M1 chip, utilize the Big Sur support page

Catalina Catalina tiny image (10.15.x) users, utilize the Catalina support page

Mojave Mojave tiny (10.14.x) users, utilize the Mojave support page

High Sierra Mac OS High Sierra image (10.13.x) users, utilize the High Sierra support page

Sierra Mac OS Sierra (10.12.x) users, utilize the Sierra support page

El Capitan el Capitan (10.11.x) users, utilize the El Capitan support page

Yosemite Yosemite small imae (10.10.x) users, utilize the Yosemite support page

Mavericks Mavericks logo (10.9.x) users, utilize the Mavericks support page

Mountain Lion OS X Mountain Lion logo (10.8.x) users, utilize the Mountain Lion support page

Lion Apple Lion logo (10.7.x) users, utilize the Lion support page

Snow Leopard Apple Snow Leopard logo (10.6.x) users, utilize the Snow Leopard support page

Leopard Apple Leopard logo (10.5.x) users, utilize the Leopard support page

Tiger Apple Tiger logo (10.4.x) users, utilize the Tiger support page



If you are still having problems, contact us


 If you have questions or suggestions for this site, contact Michael J. Danberry



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Last Update or Review:  Sunday, 15 October 2023 20:22 hrs


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