Overview

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If you registered your cellphone as a device for two-step login, you can send yourself a batch of 10 single-use passcodes. This is a good backup in case:

• Other registered devices aren't available 
• There is no wireless or cellular availability at your location
• You're traveling and don't want to connect to untrusted networks

Critical Concepts

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• You'll need to have registered a cellphone for two-step login before you can receive the batch of passcodes.  To register a phone, see Add Another Device for Two-Step Login
  
  
• The codes can be used in any order.
  
  
• Once a code is used, it is ineligible for future use (Duo tracks used codes).
  
  
• You can request a batch of 10 passcodes anytime. Requesting a new batch invalidates passcodes from a previous batch. Therefore, it's a good idea to delete the text containing older batches.
  
  
• Want to use your text passcode on the VPN?  We recommend looking over the steps to use a passcode with Two-Step on the VPN.

Steps to Take

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1. Visit the device registration portal (duo.ucsd.edu).
2. Log in to the portal with Active Directory (AD) credentials
3. Confirm that the correct phone is selected in the "Device" drop-down menu.
4. Click the green button Enter a Passcode, then click Text me new codes in the blue band that appears at the bottom of the interface (see image below).
5. You should now receive a SMS text message containing 10 single-use passcodes.
   
   • Recommendation: Store passcodes in a secure location, such as a password manager. LastPass is a good choice.
6. To use passcodes:
   
   • Single Sign-On Applications: When you receive the prompt for two-step verification, click Enter a passcode, enter one of the unused passcodes, then click Log in.
   • VPN: See the Duo Two-Step Login on VPN article for steps to take to use two-step passcodes on the VPN.