DUO - Two Factor Authentication


What Is Duo

DUO 2 Factor Authentication (DUO 2FA)

DUO 2 Factor Authentication (DUO 2FA) is a security service for DCU staff that adds another layer of security to a suite of DCU systems and services such as DCU Apps & Pulse VPN.

In addition to your DCU password, DUO 2FA provides a second layer of security by sending an approval request to your mobile or tablet.

When you or anyone attempts to log into your DCU Apps account from a remote location a notification will be sent to your smart device which you can then approve with a push of a button.

What does DUO 2FA protect? Duo Logo

Requiring two modes of authentication helps DCU protect:

  • Your DCU Apps accounts
  • DCU Pulse VPN
  • Your privacy from cyber criminals
  • You from cyber fraud
  • Phishing attacks
  • Digital deception that may exploit compromised usernames and passwords.


DUO 2FA Introduction Video

Press play to watch DUO intro video

DUO 2FA protect requires 2 modes of authentication?

Once you’re enrolled in Duo, you can log in using your DCU email address and password, then confirm your identity using the DUO app on your smartphone.

Two modes of authentication include:

  1. Something you know: - unique email address and password.
  2. Something you have: - smartphone with an app to approve authentication requests.
Benefits of Duo
Duo mobile device image

Duo protects your account and your data.

To gain access to your account, an attacker would need your passphrase as well as the physical device you use with Duo. If all the attackers have is your password, they can’t get in. If they somehow obtain your smartphone, they would still need your passphrase. In other words, one factor can fail, and the other will still protect you.

Duo protects DCU.

Duo provides improved security for DCU data assets, including accounts, applications and websites.


Duo is a simple solution.

Duo offers simple integration with other services, and the app offers an easy interface.


Self enroll to DUO 2FA

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Self Enrolment To DUO 2FA

For this process you will need a PC or a laptop and a mobile smart device with the DUO 2FA application installed.


Install the DUO MOBILE app on the mobile device you intend to use as the 2nd Factor

Visit the platform-specific app store from your mobile smart device, download and install, see links below.

Android tablet iPad Windows Tablet


To activate DUO - login with your DCU username and password (e.g. email - apps.dcu.ie) 

Welcome Screen.

DUO Self Enrolment Step 1


Click Start setup to begin enrolling your device


Choose Your Authentication Device Type

DUO Self Enrollment Step 2

Select the type of device you'd like to enroll and click Continue. We recommend using a smartphone for the best experience, but you can also enroll a tablet.


Type Your Phone Number

DUO Self Enrollment Step 3

Select your country from the drop-down list and type your phone number.

Use the number of your smartphone with you when you're logging in to a Duo-protected service.

Double-check that you entered it correctly, check the box, and click Continue.


Choose platform

DUO Self Enrollment Step 4

Choose your device's operating system and click Continue.


Install Duo Mobile

DUO Self Enrollment Step 5

After installing our app, please see links at the top of this page, return to the enrolment window and click I have Duo Mobile installed.


Activate Duo Mobile

Activating the app links it to your account so you can use it for authentication. To do this you need to have the DUO app installed on your iPhone, Android, Windows Phone or tablet


Scan QR code

On your iPhone, Android, Windows Phone or tablet activate Duo Mobile by scanning the barcode with the DUO 2FA app's built-in barcode scanner. Follow the platform specific instructions for your device:

Configure Device Options (optional)


  • You can use Device Options to give your phone a more descriptive name, or you can click Add another device to start the enrolment process again and add a second phone or another authenticator.


  • If this is the device you'll use most often with Duo then you may want to enable automatic push requests by changing the When I log in: option and changing the setting from "Ask me to choose an authentication method" to "Automatically send this device a Duo Push" or "Automatically call this device" and click Save.


  • With one of the automatic options enabled Duo automatically sends an authentication request via push notification to the Duo Mobile app on your smartphone or a phone call to your device (depending on your selection).
How to log into DCU Apps with DUO 2FA

DUO Self Enrolment Step 8

DUO Self Enrolment Step 8

Log into DCU Apps via apps.dcu.ie


Open a Chrome browser and type apps.dcu.ie into the search bar. You will land on the DCU sign in page. Enter your DCU user name and password and press The blue Login button.


Choose your authentication method (PUSH Recommended)

You will be presented with the screen below, please choose our preferred method which is a push notification. This will open a screen on your mobile device or tablet, please see next step.


Authenticate your identity with DUO 2FA application

On your mobile device you will be presented with a screen from which you have Two options.

To confirm your identity and to proceed to DCU Apps, please tap on the green approve button.

You have now successfully logged into DCU Apps using DUO 2FA.

DUO 2FA - Glossary & FAQ's


What Is Duo



2FA (two-factor authentication):  an additional layer of authentication beyond a username and password; something you know (password) plus something you have with you (like Duo Mobile app on your smartphone) ; prevents someone from logging in with only your password.

Duo Prompt: an interactive prompt lets you choose how to verify your identity each time you log in (e.g. “Duo Push”) to a web-based application.

Passcode: numeric code that can be generated via the Duo Mobile app; may be used at any time and are particularly useful for authenticating when your DUO 2FA device doesn't have internet or cellular service.

Push Notification (Duo Push): request that is sent to the Duo Mobile App on your mobile device; includes information like the geographical location of the access device, IP address of the access device, and the application being accessed so you can verify whether the push is real or fraudulent.

Self-service portal: portal for use in the Duo Prompt, you can click “My Settings & Devices” to add additional devices or update authentication method settings right from the Duo Prompt.



What is Duo Mobile? - a mobile application (app) that you install on your smartphone/tablet to generate passcodes for login or receive push notifications for easy, one-tap authentication on your mobile device.


When will I be asked to use 2FA? - when accessing DCU web services remotely or on campus.


What is the recommended two-factor authentication method? - Duo Push via Duo mobile app, as it is quick, easy-to-use, and secure.

See an introduction to Duo Security and a demonstration of Duo Push in this short video:

Press play to watch DUO intro video


Does DUO collect personal information? - No, for more info please visit: Duo Mobile Privacy Information


What if I forget my mobile device? - If you do not have access to your mobile device you can contact the ISS service desk and you can be granted temporary access via the issue of a pass code.


Can Duo see my password? - No, your password is only verified by your organization (DCU) and never sent to Duo. Duo provides only the second factor, using your enrolled device to verify it’s actually you who is logging in.


How does DUO 2FA work with generic DCU accounts?

The administrator of the generic a/c can delegate access to the generic a/c - this will allow email access option from the DCU user's own email account interface

More information on how to delegate access to a generic a/c can be viewed here


How much data does a Duo Push request use? - Duo 2FA requests require a minimal amount of data -- less than 2KB per authentication.


Where do I install the DUO app from?

On Android devices you can download the app from the Google Play Store

On Apple devices you can download the app from the Apple App Store

Please ensure that you are signed into the relevant Store prior to commencing the installation process.


Does using Duo give up control of my smartphone?

  • No, the Duo Mobile app has no access to change settings or remotely wipe your phone.


  • The visibility Duo Mobile requires is to verify the security of your device, such as OS version, device encryption status, screen lock, etc.


  • DUO 2FA use this to help recommend security improvements to your device.


  • You always are in control of whether or not you take action on these recommendations.


Is it possible to add a second device?

Yes, it is possible to add a second device to your DUO profile.

More information on how to add a second device can be viewed here.


What is a DUO 2FA security check up?

  • DUO 2FA security check up checks the following to ensure that they are all up to date.


  • Smartphone or Tablet operating system is up to date.


  • DUO 2FA application is up to date.


  • Fingerprint is enabled.


  • Screen lock is enabled.


  • The device is not jailbroken.