This page describes how to set up an authenticator app for Multifactor-Authentication (MFA).

An authenticator app is an app that shows a new one-time code every 30 seconds.

Follow these 2 steps to set up your app:

1. Download Authenticator App
2. Set up Authenticator App
3. Login with Authenticator App

In this guide, we use the 2FAS-App, but you can use a different authenticator app.

1. Download Authenticator App

Step 1
Open the app store on your device.

• Android: Google Play
• Apple: App Store
• Windows: Microsoft Store

Step 2
Download an authenticator app,such as:

• For smartphones: 2FAS, Aegis, Apple Keychain (iOS only),...
• For desktops or laptops: 2fast (Windows), Otpkey Authenticator (macOS), TOTP extension of the KeePassXC Password Manager (all operating systems).
• If you want to use another app, make sure it meets the following criteria:
  • 6- or 8-digit security code
  • Hash algorithms SHA256 or SHA512

2. Set up Authenticator App

Step 1
Open the Token Manager.

Step 2
Log in via RWTH Single Sign-On (username format "ab123456").

Step 3
Click Create.

Step 4
Under "Type of Token", select Authenticator app e.g. for smartphone (TOTP).

Step 5
Click Next.

Step 6
Under "Description", enter a name for your app (e.g. Authenticator App).

Optional
Select Advanced Options to choose the security code length and hash algorithm.

Step 7
Click Create.

A QR code appears.

Step 8
Open your authenticator app.

Please note
We have taken screenshots of the 2FAS app for this guide. If you are using a different app, the process may be slightly different.

Step 9
Tap the plus symbol.

Step 10
Scan the QR code using the app.

Alternatively, you can click Token secret below the QR code. A code will be displayed. Copy this code in the app under "Enter secret key".

A code now appears in the app.

Step 11
Enter this code in the Token Manager under "Security code".

Step 12
Click Finish.

You have successfully set up your Authenticator app.

3. Login with Authenticator app

When you are asked to enter a one-time security code, open the Authenticator app.

Copy the code displayed under “RWTH Aachen University” and paste it into the input field.

The codes are each valid for 30 seconds. If a code expires before you have entered it, simply use the next one.

Additional Information

• Help: How do I login with MFA?
• Help: my token does not work.
• Help: I lost my token.
• Please contact the developer directly if you have any problems with the application.