YubiKey 5 Firmware

These topics describe YubiKey 5 firmware versions and features released with each version.

• Firmware Overview
  • YubiKey 5 Series
  • Firmware Capability Matrices
• 5.8 Firmware Specifics
  • 5.8 Features Summary
  • CTAP 2.3 Features
  • Attestation Formats
  • Conditional Mediation for Security Keys
  • Persistent PIN User Access Token (PPUAT)
  • Persistent Credential Management Read Only (PCMR) Permission
  • FIDO over CCID and USB
  • PIN and User Verification
  • Digital Wallet and Credential Management with PRF
  • Pseudo-Random Function (PRF) Support
  • Reset-Related Capability Discovery
  • RPID Storage for Enterprises
  • Secure Payment Confirmation
  • Signing Extension (Preview)
  • Third-party payment extension
  • YubiHSM Auth credential editing
• 5.7 - 5.6 Firmware Specifics
  • 5.7.4, 5.7.x, 5.6.x Firmware
  • CTAP 2.1 Features
  • FIDO2 Extensions
  • FIDO Level 2
  • PIV Enhancements
  • PIN Complexity
  • Expanded Storage (FIDO2 and OATH)
  • Restricted NFC
  • Yubico Crypto Library
  • Yubico Root Certificate Authority (CA)
• Pre-5.6 Firmware Specifics
  • Firmware 5.4.3: YubiHSM Auth
  • Firmware 5.3.0: Secure Channel
  • Firmware 5.3.0: NFC ID Calculation Changed