Yubikey 4

4th generation multi-protocol authentication device
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YubiKey 4 is a small USB device supporting multiple authentication and cryptographic protocols. With a simple touch, YubiKey protects access to computers, networks, and online services for everyone from individual consumers to the world’s largest organizations. YubiKey 4 works on Microsoft Windows, Mac OS X, and Linux operating systems, and on major browsers.



Prevents unauthorized access by requiring the physical presence of the key to log in on that device


Crushproof and water-resistant, no batteries or moving parts

Easy to use

Plug it in and touch the gold button or edge; no codes to type or apps to install


Use it on Microsoft Windows, Mac OS X, Linux, and Chrome OS for Chromebooks


The same YubiKey can be used with nearly unlimited services


Fits nicely on a keychain, in a wallet, or inside a USB port

Two-factor authentication (2FA)  adds an extra layer of security to your account that you, and only you, can access in order to prove your identity.

Millions of people use YubiKeys fbecause they’re the easiest to use, super secure, and affordable. Plug in your YubiKey and tap it to log in to your computers, networks, and online services. Keep one on your keychain with the key to your house/car, and a second YubiKey in a safe place as a backup.

YubiKey 4 Series comes in 3 form factors. Each option includes the same internal components, functionality, and capabilities.

Yubikey 4

Yubikey 4 C

Yubikey 4 Nano

Easily integrated with the most popular services

Use it with popular services like Facebook, Gmail, GitHub, Dropbox, Dashlane, LastPass, Salesforce, Duo, Docker, Centrify, and hundreds more. Configurable for computer login (Windows, Mac, Linux). Follow the instructions that each service provides to register your YubiKey.

All-in-one configurable security key

Different services use different types of security protocols. YubiKeys are capable of performing multiple protocols, so you can use the same key for almost an unlimited number of services

  • FIDO U2F
  • Secure Static Passwords
  • smart card (PIV)
  • Yubico OTP
  • Code Signing
  • OpenPGP
  • Challenge-Response
Technical Specs
USB authentication key, including strong crypto and touch-to-sign, plus One-Time-Password, smart card, and FIDO U2F; three form factors.
Size YubiKey 4 (keychain) YubiKey 4 Nano YubiKey 4C (keychain)
18mm x 45mm x 3.3mm, 3g 12mm x 13mm x 3.1mm, 1g 12.5mm x 29.5mm x 5.5mm, 2g
Certifications YubiKey 4 (keychain) YubiKey 4 Nano YubiKey 4C (keychain)
FIDO Certification™ program yes yes yes
FIPS 140 Certification
Communications Support YubiKey 4 (keychain) YubiKey 4 Nano YubiKey 4C (keychain)
USB-A yes yes no
USB-C no no yes
NFC (Near Field Communication) no no no
Device Type YubiKey 4 (keychain) YubiKey 4 Nano YubiKey 4C (keychain)
HID Keyboard yes yes yes
CCID Smart Card yes yes yes
FIDO U2F (Universal Second Factor) HID device yes yes yes
Cryptographic Specifications YubiKey 4 (keychain) YubiKey 4 Nano YubiKey 4C (keychain)
RSA 2048 yes yes yes
RSA 4096 yes yes yes
ECC p256 yes yes yes
ECC p384 yes yes yes

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