YubiKey Technical Manual Logo

Contents

  • Introduction to the YubiKey Series
  • Physical Attributes
  • Firmware Overview
  • Protocols and Applications
  • 5.7 - 5.6 Firmware Specifics
  • Pre-5.6 Firmware Specifics
  • YubiKey 5 FIPS Series Specifics
  • YubiKey Bio Series Specifics
  • Secure Channel Protocol (SCP03 and SCP11)
  • NFC ID Calculation Technical Description
  • Tools and Troubleshooting
  • YubiKey 5 CSPN Series Specifics
  • Acronyms
  • Copyright
    • Trademarks
    • Disclaimer
    • Contact Information
    • Getting Help
    • Feedback
    • Document Updated
YubiKey Technical Manual
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Copyright

© 2021-2026 Yubico AB. All rights reserved.

Trademarks

Yubico and YubiKey are registered trademarks of Yubico AB. All other trademarks are the property of their respective owners.

Disclaimer

The contents of this document are subject to revision without notice due to continued progress in methodology, design, and manufacturing. Yubico shall have no liability for any error or damages of any kind resulting from the use of this document.

The Yubico Software referenced in this document is licensed to you under the terms and conditions accompanying the software or as otherwise agreed between you or the company that you are representing.

Contact Information

Yubico AB
Gävlegatan 22
113 30 Stockholm
Sweden

Getting Help

Documentation is continuously updated on https://docs.yubico.com/ (this site). Additional support resources are available in the Yubico Resources and Solutions

Contact

  • Submit a request
  • Contact our sales team
  • Set up your YubiKey

Feedback

Yubico values and welcomes your feedback. If you think you may have discovered a flaw in our product, please submit a support request at https://support.yubico.com/s/requests and provide as much detail as you can.

Document Updated

2026-03-06 23:52:14 UTC

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